Multi-pulse laser radar emits hundreds of high repetition frequency laser echo to accumulate, and needs dynamic target signal simulation to verify the detection performance based on target echo waveform model. Pulse laser echo waveform can be modeled through the convolution relationship among the laser emission, channel propagation and target reflection. Firstly, the mathematical descriptions of each component part were established, and the echo waveform model was given by continuous convolution. Then, for the problem that the analytical model was not conducive to the engineering implementation, the discrete algorithm of target echo waveform sequence was presented based on transmitted pulse range resolution. According to the echo signal simulation of long-range aircraft target, the intrinsic relationship between the echo waveform and the target characteristic was pointed out, and the reliability was verified by the experiment. Finally, the development and implementation of the multi-pulse laser radar dynamic target simulator was presented, which provided the necessary verification test conditions for the research of multi-pulse laser target detection.