A would-be rapist laughed as he attacked a Queens woman while she was walking home, police said Tuesday.

The 31-year-old victim told police she had just left the Roosevelt Avenue-Jackson Heights train station at 74th Street and Broadway around 9:30 p.m. when the stranger approached her, cops said.

The man reached under her shirt and grabbed her breasts, breaking her bra in the process, police sources told The Post.

He then pulled her to the ground by her hair and tried forcing her pants off, but the woman resisted, and her attacker fled, police said.

The man laughed as he tried raping her, authorities said.

The victim described the man as being approximately 25 years old, 6 feet tall and 180 pounds, cops said.

The NYPD’s Special Victims Unit is investigating the incident.