The invention relates to the technical field of wireless communication, in particular to a service transmission method and a terminal, which are used for solving the problem that in the prior art, system interference or incorrect receiving is possibly caused by the adoption of fixed transmission times in a V2X scene. According to the embodiment of the invention, the terminal transmits the TB through the resources in the sub-resource selection window; for the periodic service, the scheduling mode corresponding to the TB is an SPS scheduling mode, for the periodic service, the scheduling mode corresponding to the repeated transmission of the TB is a DS scheduling mode, and for the non-periodic service, the scheduling mode corresponding to the initial transmission and the repeated transmission of the TB is a DS scheduling mode. Due to the adoption of the DS scheduling mode, retransmission is carried out after transmission failure, so that fixed retransmission times are not needed, and thesystem capacity is improved.