The number of Asian kids admitted to the city’s specialized high schools would plummet by roughly half under City Hall’s proposed admissions revamp, according to a new report.

The analysis by the nonpartisan Independent Budget Office found that Asians would get 31 percent of offers under the proposal — compared to the 61 percent who enrolled as freshmen for the 2017-2018 school year.

“This is an independent corroboration of our worst fears,” said Wai Wah Chin of the Chinese American Citizens Alliance of Greater New York. “You don’t promote justice for one group by promoting injustice for another group.”

To enroll more black and Hispanic students at the largely Asian and white schools, Mayor de Blasio and Schools Chancellor Richard Carranza hope to abolish the current single-test admissions structure and instead admit kids who finish in the top 7 percent of every middle school in the city.

The IBO applied these changes to the 2017-2018 applicant pool — and found that admissions would be markedly different.

Offers to the city’s black students would soar to 19 percent compared to the 4 percent who enrolled that year, the study found. Hispanic admission offers would also jump, from 6 to 27 percent.

White specialized-high-school enrollment offers would stay comparably flat, ebbing from 24 to 20 percent.

Female applicants would be major beneficiaries of the overhaul, with admissions offers jumping from 41 to 66 percent.

The proportion of students considered to be living in poverty who attain special-high-school admittance offers would rise from 50 to 63 percent.

Backers of the reboot argue that the current admissions structure is needlessly narrow and fails to detect a wider range of talented kids across the city — many of them black and Hispanic.

The backers also assert that kids who show the requisite drive to finish near the top of their middle schools would acclimate to elite-school rigor.

Supporters of the status quo counter that it rewards raw diligence and preparation and defends against opaque admissions practices.

Asian kids would still comprise the highest percentage of specialized-high-school enrollees, the IBO noted.