Hydrogen detection high-background vacuum tank

The utility model relates to a hydrogen detection high background vacuum tank, which comprises a tank body and a valve arranged at the top of the tank body, a hydrogen leak-proof device is arranged at the top of the tank body, the hydrogen leak-proof device comprises fixing blocks which are symmetrically arranged at the top of the tank body and are connected in a clamping manner, a cavity is arranged at the top of one side of the symmetrically arranged fixing blocks, and the valve is arranged at the top of the tank body. A motor is arranged at the top of the cavity, an execution end of the motor penetrates through the cavity and is provided with a rotating part, a rack is arranged on the outer wall of the rotating part in a meshed mode, a buffer pad is arranged at one end of the rack, a movable block is arranged at the other end of the rack, a magnetic attraction part is arranged in the movable block, and a clamping part is arranged on one side of the magnetic attraction part; the utility model relates to a v