Mayor Bill de Blasio’s campaign plans to return $32,200 to seven contributors, just weeks after it was disclosed that state and federal investigators were looking into possibly illegal donations to his 2013 run for City Hall.

De Blasio campaign spokesman Dan Levitan said the city’s Campaign Finance Board has been notified that the refunds would be made “as soon as feasible.”

Sm-Ali Amanollahi, owner of the Queens-based Primary One beauty products company; his drivers, Rafael Zepeda and José Zepeda; and his associates Charalambos Anastassopoulos, Giuliano ­Bruschi and Ralph Scopo each donated $5,000 to de Blasio, records show.

All the donations except one were made on the same day: Oct. 21, 2013.

The de Blasio campaign immediately returned $50 to each donor for going over the $4,950 limit prescribed by city campaign rules.

Angela Parra, who also works for Primary One, added another $2,500 to the mayor’s campaign account just days later on Oct. 29, 2013.

It is illegal to make campaign contributions in someone else’s name, a practice known as “straw donations.”

The donations being refunded, which were first reported by DNAinfo, include six that exceeded the maximum allowed by $50.

The timing of the Primary One donations, the fact that they all exceeded the limit by the same amount, and the working-class jobs held by donors giving thousands of dollars have raised red flags.

The generosity of the employees from the Queens-based company didn’t end with the campaign.

Six each chipped in another $4,500 to de Blasio’s transition committee, which picked up expenses after the mayoral election.

Because that committee has been shut down, Levitan said $27,000 in combined donations could not be returned.

Most of the donors could not be reached Monday.

“The campaign holds itself to the highest legal and ethical standards, and in light of the questions raised about these contributions has elected to return them,” Levitan said.

Rafael Zepeda referred calls to his attorney.

He was among those who donated the maximum to the mayor’s campaign and another $4,500 to the transition fund.

When asked earlier this month about the nearly $10,000 in donations, Zepeda initially confirmed them and then claimed that he gave nothing at all.

Amanollahi told The Post earlier this month that he, like Rafael Zepeda, had retained a lawyer.

He said at the time that his employees made very good money, but refused to say how much.

“They’ve been taken care of,” he said, adding that his workers receive “five-figure” salaries.

He also balked at questions about whether he instructed his employees to give money to de Blasio.

“I’m not going to touch that,” he said.

Amanollahi dates Rud Morales, a member of the de Blasio inaugural committee and a board member of the Mayor’s Fund to Advance New York City, which is headed by Hizzoner’s wife, Chirlane McCray.