Experimental device and experimental method for diaphragm wall of earth rock cofferdam of deep covering layer

The invention relates to a deep covering layer earth rock cofferdam anti-seepage wall experimental device and experimental method, and belongs to the technical field of earth rock cofferdam seepage prevention. The deep covering layer earth rock cofferdam anti-seepage wall experimental device comprises an anti-seepage wall and a box body used for simulating a deep covering layer earth rock cofferdam; the anti-seepage wall comprises an anti-seepage wall body, and a plurality of spring buckles are arranged at the two ends of the anti-seepage wall body at equal intervals in the vertical direction. The box body is a cuboid, the top of the box body is open, at least three vertical elastic sliding grooves matched with an anti-seepage wall are oppositely formed in the middles of the inner sides of a pair of side walls to correspond to the front portion, the middle portion and the rear portion of the earth rock cofferdam, and limiting structures are arranged at the tops of the vertical elastic sliding grooves to limit