Centrifugal pump mechanical seal device capable of preventing mechanical seal from being burnt out

The invention provides a centrifugal pump mechanical seal device capable of preventing a mechanical seal from being burnt out, and relates to the technical field of centrifugal pump mechanical seal devices.The centrifugal pump mechanical seal device comprises a pump body, a water inlet pipe is fixedly installed on the outer end face of the pump body, and a water outlet pipe is fixedly installed on the upper end face of the pump body; two first supporting frames are fixedly installed on the lower end face of the pump body, and the first supporting frames are of an inclined structure. According to the water pump, when the driving shaft drives the impeller to rotate rapidly, the speed of water flow in the pump body can be correspondingly increased, under the impact effect of the water flow, a plug plate can drive a stretching rod to move backwards, at the moment, water can enter a sealing barrel through a connecting pipe, and the temperature of the driving shaft can be reduced when the water flow drops on the su