Fixing device for inversely-placed cell cryopreservation tube cap

The utility model discloses a fixing device for inversely placing a cell cryopreservation tube cap, which comprises a bottom plate, a support plate and a top plate, the top end of the bottom plate is provided with a support structure, and the top end of a tube cap main body is provided with a cryopreservation tube main body. The fixing structure is arranged, the protruding height of each boss is 5 mm, the cross section of each boss is hexagonal, the side length of each boss is 4.5 mm, the size of each boss is adjusted to be suitable for the hole diameter of the pipe cap body, the pipe cap body can be fixed to the bosses and prevented from moving, threads are arranged on the periphery of the connecting rod, the connecting rod can move upwards along with rotation of the bosses on the upper layer, and the bosses and the connecting rod rotate through the threaded rings. The bosses integrally move upwards, the height of the bosses is increased, the diameter of the connecting rods is shorter than the diagonal lines