The utility model discloses a turnover temporary fire-fighting water tank for a construction site. The turnover temporary fire-fighting water tank comprises an outer tank, an inner tank, a water outlet and a water inlet, an inner box is arranged in the outer box; a motor and an electric push rod connected with the motor are arranged at the bottom of the outer box; a protective corrugated sleeve isarranged outside the motor, and the upper end of the corrugated sleeve is hermetically fixed with the bottom of the inner box; the electric push rod is fixed to the bottom of the inner box; a plurality of pressure valves are arranged at the bottom of the inner box; a water outlet is formed in the side surface of the lower part of the outer box; a connecting plate is arranged on the upper surfaceof the outer box, and a water collecting hopper is arranged on the connecting plate; a filter screen is arranged at the opening of the water collecting hopper; an inclined blast pipe is arranged in the water collecting hopper, and is provided with an upward blast hole and a downward water leakage hole; the blast pipe is connected with a blower; the filter screen is positioned above the blast pipe;a group of rollers are arranged at the bottom of the outer box. The solar water heater is reasonable and simple in structure, capable of fully utilizing water resources, convenient to transfer and transport, energy-saving and environment-friendly.