Social conformity represents the propensity to align one’s own attitude and behavior with the majority’s, which is critical for adaptation to social norms. Methamphetamine abuse has been widely associated with risk-seeking and norm violation. However, whether risk attitude and behavior in individuals with methamphetamine use disorder (MUD) could be modulated by social conformity has remained unclear. Here, we report that MUD participants exhibited increased risk-taking behavior and reduced social conformity. Compared to controls, the MUD group showed decreased conformity when observing other’s risk-averse decisions but increased conformity when observing other’s risk-seeking decisions. Our model based on other-conferred utility (OCU) demonstrated attenuated OCU and increased risk preference in the MUD group. Importantly, OCU was significantly correlated to the degree of MA abuse. Taken together, our results suggest that social conformity is impaired in individuals with MUD, which might exacerbate their impulsivity in drug abuse behavior.