Small aircraft fuel tank draining valve switch

The invention discloses a small aircraft fuel tank draining valve switch. The switch comprises a shell, a base which passes on the shell, a valve core which is arranged on the base and a pressure bolt with an axial through hole in the middle, wherein the valve core is cylindrical, the lower part of the valve core is a conical thimble, the thimble extends into the through hole, a shaft shoulder is arranged on the valve core, a sealing ring capable of preventing oil leakage is arranged between the shaft shoulder and the upper end surface of the pressure bolt; the valve core passes through the middle of the base, a first spring is sleeved on the outer part of the valve core, and the lower part of the first spring is arranged on the shaft shoulder. The thimble is arranged on the lower part of the valve core, the through hole is arranged in the middle of the pressure bolt, and the first sealing ring is added. In the prior art, the bolt should be unscrewed to drain fuel, and in the invention it is only necessary to use a tool to jack up the thimble, so that the fuel is drained through the bolt through hole, the thimble is loosed, and the draining valve is closed. The draining valve switch is safe and reliable, is good in reliability and convenient to operate, and the maintainability and safety of aircrafts are greatly improved.