Airplane auxiliary fuel tank stop mechanism

The utility model discloses an airplane auxiliary fuel tank stop mechanism which comprises a welding seat (1), a support (2), a pin shaft (3), a first spring seat (4), a screw (5), a spring (6), a stop block (7) and a second spring seat (8), the welding seat (1) is installed on an auxiliary fuel tank in a sealing mode, the screw (5) penetrates through a flange plate of the support (2) to be in threaded connection with the welding seat (1), a butt joint is manufactured at the upper end of the stop block (7), and a hole cavity is formed in the lower end of the stop block (7). The spring (6), the first spring seat (4) and the second spring seat (8) are arranged in a hole cavity, the lower end of the stop block (7) is arranged in the support (2), a long groove is formed in the outer wall of the lower end of the stop block (7) in the axial direction, the pin shaft (3) penetrates through the support (2), the long groove of the stop block (7) and the first spring seat (4) in the radial direction to form a linear mot