Tap water storage tank capable of self-purifying depending on cladophora

The invention discloses a tap water storage tank capable of self-purifying depending on cladophora. The tap water storage tank comprises a tank body and a tank cover, the tank body and the tank cover are light-admitting bodies, a chamber of the tank body is divided into an upper chamber and a lower chamber by a light-admitting partition board which is installed in the tank body, a plurality of water penetrating holes communicated with the upper chamber and the lower chamber are formed in the light-admitting partition board, a high-calcium-magnesite stone granular layer is laid on the upper surface of the light-admitting partition board, the inner bottom face of the bottom of the tank body is an inclined face which inclines downwards, a sewage discharge outlet penetrating through the bottom of the tank body is formed in the lowest portion of the inner bottom face of the tank body, and the water inlet which is located above the light-admitting partition board and the water outlet which is located above the light-admitting partition board are formed in the sidewall of the tank body. Compared with the prior art, a survival environment is provided for the cladophora, self-purifying of water in the tank body can be conducted by the cladophora, cleaning of the tank body is not needed, the removal of residual chlorine, organic chloride, organic matter and ammonia nitrogen in a water body is achieved, and microalgae breeding in the water is inhibited.