North Queensland police officers have gone beyond the call of duty to help two little boys with their lemonade stand.

Constables Matt Cornish and Hannah Mulholland spotted 7-year-old Will and 3-year-old Jack Reilly on a Port Douglas road with a table, umbrella, hand made signs and plenty of icy chilled lemonade.

Watch the heartwarming story in the clip above

When they discovered the young brothers were raising money for bushfire victims, they quickly set to work.

The officers helped the boys move their stall to the main road, where they set up a roadside breath testing site.

Drivers were waved in for routine breath tests and license checks, and once in the clear, they were greeted by Jack, Will and their lemonade stand.

The lemonade stand and breath testing site were set up on one of Port Douglas' main roads. Credit: Supplied

"We watched the bushfires on TV and how big and scary it was and all the people and animals that lost their homes and lives, so we wanted to help, little Will told Sam and Kochie on Sunrise.

"Usually as Police we come across pretty horrific scenes, so when we do come across a positive story like this the least we can do is help out," Constable Cornish said.

"People were pretty surprised, but once they figured out what it was for they were happy to get on board and support a good cause," Constable Mulholland added.

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