Protective support capable of achieving stable butt joint

The utility model discloses a protective support capable of achieving stable butt joint. The protective support comprises a hydraulic supporting rod, a butt joint mechanism, an arc-shaped supporting plate and a shielding mechanism. A butt joint mechanism is arranged at the top end of the hydraulic supporting rod, the hydraulic supporting rod serves as a supporting foundation, an arc-shaped supporting plate is connected to the upper portion of the butt joint mechanism, and a shielding mechanism is arranged in the arc-shaped supporting plate. According to the protective support capable of achieving stable butt joint, a hydraulic supporting rod can be installed below a concentric-square-shaped frame by screwing a threaded rod into an inner threaded cylinder, after two sets of L-shaped inserting plates are inserted into a T-shaped butt joint groove, a rotating handle is rotated anticlockwise till the ends of the two sets of L-shaped inserting plates abut against the inner walls of the two sides of the T-shaped bu