Coal fracturing similar simulation device based on mining protective layer principle

The invention discloses a coal fracturing similar simulation device based on the mining protective layer principle, which comprises a transparent test box, one front side wall and one side wall of the transparent test box are detachable, and a simulation layer enters the transparent test box through a conveying assembly arranged on the front side wall of the transparent test box; the pressurizing assembly is fixed at the top end of the experiment box and the pressurizing end of the pressurizing assembly contacts with the top end of the simulation layer; the hydraulic joint-cutting assembly corresponds to the side wall of the side surface of the transparent test box, and the joint-cutting end of the hydraulic joint-cutting assembly extends into the simulation layer; the video detection assembly is arranged on the side, away from the conveying assembly, of the transparent test box and corresponds to the simulation layer. The coal seam fracturing mechanism under the combined loading synergistic effect of hydraul