The invention discloses a transmission method, device and system for a hybrid automatic repeat request. The method, device and system are applied to device-to-device communication. The method includes: a first set of user equipment sends service data to a second set of user equipment; and the first set of user equipment detects response feedback information and/or authentication information, wherein the feedback information is used for representing whether the second set of user equipment receives the service data correctly; and when the response feedback information represents that the second set of user equipment does not receive the service data correctly and/or when it is judged that the authentication information is used for scheduling the first set of user equipment for retransmission of the service data, the first set of user equipment retransmits the service data to the second set of user equipment according to a preset round trip time. Through the transmission method, device and system for the mixed automatic retransmission requests, HARQ transmission problems in D2D communication are solved so that an HARQ transmission method based on the D2D communication is realized and reliability of the transmission method in a communication system is improved.