The invention provides an intelligent blood heat preservation system, comprising: a heat preservation box with a water storage cavity arranged inside; a heating device arranged at the bottom of the water storage cavity and used for heating water in the water storage cavity; a control circuit including a start switch, a switch triode and a protective switch, wherein one end of the start switch is connected with a power source, the other end of the start switch is connected to a positive electrode of the heating device, a negative electrode of the heating device is connected to a collector of the switch triode, an emitter of the switch triode is grounded, a base of the switch triode is connected to one end of the protective switch, the other end of the protective switch is connected to a 5 vpower source, the protective switch is mounted in the water storage cavity and includes a floater, the floater can keep the protective switch off under the gravity action when water is absent, and the floater can keep the protective switch on under the floating action when water is present. The intelligent blood heat preservation system helps solve the problem of the prior art that a whole deviceis burned out due to forgetting to add water.