Efficient solar water heater with pressure control function

The invention relates to an efficient solar water heater with a pressure control function. The efficient solar water heater comprises a water tank and at least two heat collecting pipes, and further comprises an adjusting mechanism and a cleaning mechanism, wherein the adjusting mechanism comprises a sealing cylinder, a lifting cylinder, a support sleeve, a spring, a support rod, a ventilation pipe and a power cylinder; the cleaning mechanism comprises a power module, a transmission module, a second pipe, a first pipe, at least two nozzles and at least two cleaning modules; the cleaning modules comprise connecting rods, cleaning bars, first gears and two mounting bearings; the transmission module comprises a first connecting shaft, a second gear and a third gear; and the power module comprises fan blades, a second connecting shaft and a fourth gear. In the efficient solar water heater with the pressure control function, the internal pressure of the solar water heater can be adjusted through the adjusting mech