Sexual assault and harassment (SAH) has become an increasing global concern that disproportionately impacts gender and sexual minority youth, yet research is scarce outside Western nations. In addition, sexual assault and sexual harassment are closely related experiences in both academic inquiries on sexual victimization and public discussion in the global #Metoo movement. Drawing from a large Chinese college student sample (N = 50,818), we investigated the prevalence of SAH victimization during childhood, adolescence, and emerging adulthood, as well as the SAH disparities between sexual minority and heterosexual youth. The population‐weighted prevalence of SAH victimization was estimated to be 20.23% during childhood, 42.87% during adolescence, and 21.87% during emerging adulthood, with more than half of the youth (55.41%) having ever experienced any SAH. Logistic regression results suggested girls and sexual minorities were disproportionally impacted across childhood, adolescence, and emerging adulthood. The discussion is framed in the context of Chinese culture and current Chinese legislation related to SAH.