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Aiming at the problem that the local path planning algorithm is only applicable to single-vehicle robots, this paper proposed a dynamic window algorithm for trailer-type mobile robots. Firstly, it used the equation of multi-vehicle structure to realize the motion control of the trailer mobile robot. Then, it used the evaluation function to evaluate both the tractor and the trailer and add them according to the weights. Finally, for the structural characteristics of the trailer, it added the angle constraint between the tractor and the trailer during the movement to ensure the stability of the motion track. The simulation experiments show that the motion control of the trailer-type mobile robot can satisfy the convergence. At the same time, the proposed algorithm realized the task of the local path planning of the trailer-type mobile robot, and the variation of the angle was beyond the limit during the motion. This research has great reference value for the autonomous navigation of trailer-type mobile robots. [ABSTRACT FROM AUTHOR]