In order to reasonably allocate the mobile robot task in the capacity unit of power battery production line, optimize the robot scheduling path, and improve the scheduling efficiency, under the circumstances of considering the constraints of equipment machining working hours, physical position, etc., taking the minimization of scheduling task time as the goal, the multi-mobile robot scheduling model under the monorail constraint of multi-procedure machining unit is established, the genetic algorithm is designed to find a solution with MATLAB, and the objective function values and convergence situation under the different robot allocation schemes are given. The results show that it can reduce the scheduling time and improve the scheduling efficiency to use the proposed scheduling method to plan for the monorail multi-robot service range.