Cops are searching for a perv who tried to sexually assault a woman on a Queens street — and then ran off when his would-be victim fought back.

The 20-year-old woman was walking near the corner of 27th Street and 30th Avenue in Astoria at about 2 p.m. Saturday when the unidentified man walked up to her, tried to put his hand up her shorts and pushed her against a fence, according to police.

The woman fought him off, and the creep fled south on 27th Street, cops said. The victim was not hurt during the assault.

Cops said the suspect was about 5-feet, 10-inches tall and weighed about 165 pounds.

In a short surveillance video clip tweeted by the NYPD, he is seen wearing a gray hoodie, black baseball hat, gray shorts, black sneakers and a red backpack.

Police are asking anyone with information to call the department’s tip line at 800-577-TIPS.