Leakage-proof deionizer for fuel cell and fuel cell system

The utility model provides an anti-leakage deionizer for a fuel cell and a fuel cell system, and relates to the technical field of fuel cells. The anti-leakage deionizer for the fuel cell comprises a deionizer shell, and a deionizing filter screen, a supporting piece and deionizing resin which are arranged in the deionizer shell, the peripheries of the deionizing filter screen and the supporting piece are in sealed contact with the deionizer shell, and the central area of the supporting piece is hollow so as to ensure a relatively large water flow rate; and the deionizing filter screen, the supporting piece and the deionizing resin are sequentially arranged from the inlet of the deionizer along the water flow direction. According to the deionization filter screen, the outer edge of the supporting piece participates in sealing, the central area is hollowed out, the structural strength is considered, meanwhile, large water flow is guaranteed, and the resistance of the supporting piece to water is reduced. The d