The embodiments of the present invention disclose a method for processing channel collisions in direct mode operation and a terminal, which can ensure correct transmission of service data and improve user experience. The method in the embodiments of the present invention includes: receiving, by a first terminal, first SCI sent by a second terminal and second SCI sent by a third terminal, and detecting whether a channel collision occurs between the second terminal and the third terminal according to the first SCI and the second SCI; and if a channel collision occurs between the second terminal and the third terminal, generating, by the first terminal, a channel collision message and sending the channel collision message, so that the second terminal and the third terminal can resend the service data according to the channel collision message. The embodiment of the invention also discloses a terminal. The embodiments of the present invention can ensure the correct transmission of the service data and improve user experience.