The invention provides a solar steam cement curing device. The device comprises a vehicle body, a heating device, a circular device and a spraying device; the vehicle body comprises a chassis and steering wheels, a water storage tank supporting base is arranged on the upper end face of the chassis, the heating device comprises a supporting frame, a solar heat collector and a solar photovoltaic cell, the circular device comprises a first circular pipeline, a second circular pipeline and a water storage tank, an automatic exhaust valve is arranged between the upper end of the first circular pipeline and the solar heat collector, a direct-current circular pump, an expansion tank and a liquid injection valve are arranged on the second circular pipeline, and the spraying device comprises a telescopic rod, a nozzle and a steam conveying pipeline; and the upper end of the telescopic rod is connected with the nozzle, the lower end of the telescopic rod is connected with the chassis, a steam spraying switch is arranged between the lower end of the steam conveying pipeline and the water storage tank, a temperature pressure safety valve is arranged between the steam spraying switch and the water storage tank, and a temperature sensor is arranged at the upper end of the side wall of the water storage tank. The solar steam cement curing device is suitable for field operation, and is energy-saving, environment-friendly and low in energy consumption.