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.

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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.