The invention discloses an explosion-proof solar water storage tank. The tank comprises a base, a bottom plate, a supporting column, a supporting seat, a tank body, an exhaust barrel and a clamping plate, an exhaust channel, a first transverse plate, a fixing column, a sliding sleeve, a reset spring and a third hinge seat are arranged inside the exhaust barrel, first vent holes are symmetrically formed in the first transverse plate along a center, first separation plates and first slotting grooves are arranged in the first vent holes, a mounting rod is arranged at the bottom end of the sliding sleeve, and a round plug is mounted at the bottom end of the mounting rod. According to the tank, clamping plates can clamp a box body, the stability of the box body is guaranteed, meanwhile, the possibility that the box body explodes outwards is prevented, when gas is generated in the box body, the gas starts to flow into the exhaust channel along with gas accumulation, the exhaust channel forms a channel connecting the interior of the box body with an external space, exhaust operation is achieved, when the gas is gradually reduced and the stress on the round plug gradually disappears, the reset spring can drive the sliding sleeve to return, and the first partition plates can also return to block the first vent holes again, so that automatic sealing is realized.