The belt type assembly of proton exchange membrane fuel cell is more compact and have higher power density than the screw assembly method. The uniform distribution of fuel cell stack clamping load directly affects the efficiency, reliability and durability of the stack. The design of high-strength and light-weight packaging structure is conducive to improving the lightweight level of the whole stack system. In this paper, the finite element model of the belt type clamping stack was established by numerical simulation, and the effects of the number of belts and endplate radius on the stress of the stack and the clamping structure were analyzed. The results reveal that increasing the number of belts can improve the uniformity of contact pressure distribution inside the stack, increasing the width of the belt can improve the bearing capacity of the belt and the uniformity of the contact pressure of the stack better than increasing its thickness. When different numbers of belts are clamping, the stress of each belt is not consistent, and the middle belt first yields. Increasing the endplate radius has little effect on the uniformity of the contact pressure distribution of the stack, but can improve the bearing capacity of the belt.