Tennis racket swinging posture fixing trainer

The tennis racket swinging posture fixing trainer comprises a base, a shell is installed at the top end of the base, an inlet is formed in the top end of the shell, a rubber block is installed at the top end of a connecting block, dismounting and mounting structures are installed on the two sides of the connecting block, and a moving groove is formed in the shell. A first telescopic rod is movably connected to the top end of a connecting block, the first telescopic rod and the connecting block form a clamping structure, a moving plate can move in a moving groove, a spring has elasticity, the elasticity of the spring can push the moving plate to move, and the moving plate can move to drive a push plate to move; the push plate moves to drive the buckle to be clamped into the connecting block and the first telescopic rod, the first telescopic rod is fixed, when the device needs to be disassembled, the buckle is pulled open, the device can be disassembled, the device can be conveniently taken out, and therefore t