A method for flexible feedback in V2X transmission, and a user equipment are provided. The method implemented in a receiving UE (user equipment) includes the following. A feedback requirement indicated by a transmitting UE is received during V2X transmission. A feedback resource is determined according to the feedback requirement. Feedback information is sent to the transmitting UE on the feedback resource according to the feedback requirement. The method implemented in a transmitting UE includes the following. A feedback requirement is indicated to a receiving UE during V2X transmission. Feedback information sent by the receiving UE on a feedback resource according to the feedback requirement is received, where the feedback resource is determined by the receiving UE according to the feedback requirement.