Exhaust pipe of solar water heater

The invention relates to the field of solar water heaters, in particular to an exhaust pipe of a solar water heater. The exhaust pipe comprises an inner pipe, an insulating heat-preservation sleeve and a monitoring component. The inner pipe is fixed on the upper portion of a heat-preservation water tank of the solar water heater, a spiral flow guide pipe is arranged in the inner pipe, and the upper end and the lower end of the inner pipe are both arranged to be open. The insulating heat-preservation sleeve is sleeved at the upper end of the inner pipe, a micro motor and a pair of fixed pulleys are mounted at the top end of the inner portion of the insulating heat-preservation sleeve, one end of a steel wire rope wound on the fixed pulleys is connected with the output end of the micro motor, and the other end of the steel wire rope is fixed at the bottom of the insulating heat-preservation sleeve. The monitoring component comprises a temperature sensor and a pressure sensor which are respectively arranged in a