The invention relates to an adaptive broadcast protocol based on a distance and a speed in a vehicle-mounted ad hoc network, and belongs to the technical field of the vehicle-mounted ad hoc network. The protocol comprises the steps of: S1: for the vehicle-mounted ad hoc network, judging a road type, and respectively aiming at a road segment model and an intersection model, adopting different relay forwarding strategies; S2: solving an intersection misjudgment problem of a distance-based adaptive broadcast protocol in the road segment model by adopting an intersection misjudgment recovery strategy; and S3: simultaneously, introducing a forwarding confirmation mechanism based on a data packet so as to further improve reliability of a broadcast. According to the adaptive broadcast protocol disclosed by the invention, aiming at the road segment model and the intersection model, different relay forwarding strategies are designed; meanwhile, in order to improve reliability of transmission, in the entire data forwarding process, the forwarding confirmation mechanism based on the data packet is introduced, and on the premise of not increasing occupation of an additional message for network resources, forwarding confirmation is carried out by utilizing the data packet, so that reliability of transmission is improved to a certain degree.