The invention discloses a fluid storage and purification integrated device for a fuel cell and a fluid cooling system of the fuel cell. The fluid storage and purification integrated device comprises a box body, a fluid storage chamber is arranged in the box body and is used for storing cooling fluid, the top part of the box body is provided with a gas release valve, the box body is provided with a cooling fluid inlet and a cooling fluid outlet, the cooling fluid inlet and the cooling fluid outlet are communicated with the fluid storage chamber, the cooling fluid outlet is arranged in the middle lower part of the box body, a porous cooling fluid purification element is also arranged in the fluid storage chamber and between the inlet and the outlet, and the effective volume of the fluid storage chamber non-filled by the purification element can meet fluid storage requirements for supplying the cooling fluid to the cooling circulation system of the fuel cell. Since the fluid storage, purification and even heating are integrated in the integrated device, the pipeline of the cooling circulation system of the fuel cell can be simplified and reduced, the number of sealing points can be reduced, the influence of bubbles on distribution of the cooling fluid in galvanic pile can be reduced, the number of fluid supply control components and operation can also be reduced, all the cooling fluid can be maintained in the fluid state in low-temperature environments, and the operating reliability of the system can be improved.