Due to the poor control effect of electric vehicle suspension system and the failure to extract material surface cracks, in order to reduce the integrity and effect of crack repair, the control of electric vehicle suspension system and laser cladding repair method of material surface cracks are proposed. Firstly, the dynamic model of electric vehicle is constructed, and the suspension performance is analyzed. Based on this, LQG controller is designed to realize the control of suspension system. The flood filling algorithm is used to extract the crack target on the material surface, and the height and width of the crack are calculated. An neural network is used to construct the laser cladding repair model to complete the repair of the crack on the material surface. Experimental results show that the proposed method has good control effect, high integrity and good effect.