The invention discloses a water resistance test box, is applied in the field of component inspection, and aims at solving the technical problem that the existing test equipment cannot guarantee a stable test environment. The technical scheme is that the water resistance test box comprises a test box body; an opening is formed in the test box; a cover plate is glidingly connected with the opening;a test cavity is formed in the opening of the test box body; and a support platform is arranged on bottom wall of the test cavity; a water pressure nozzle is arranged on the cavity wall of the test cavity; an air curtain groove is formed in the cavity wall of the test cavity; an air curtain machine is arranged in the air curtain groove; the support platform comprises annular support brackets and avertical insert fixed between the annular support brackets; a storage rack is inserted on the vertical insert; the storage rack comprises a storage insert which is fixed through a connecting piece; alocking slider is glidingly connected with the storage insert; and elastic locking blocks are arranged on both sides of the locking slider. The water resistance test box has the technical effect of improving the accuracy of test results by providing a stable test environment.