The invention discloses a visual fracture type rock plate acid liquor etching experimental device and method. The experimental device comprises a visualization experiment unit, an acid supply unit, a pressure supply unit and a waste liquor collecting unit, the visualization experiment unit comprises a protection frame, a visualization rock plate cover, a visualization rubber sleeve, a sealing cover, a liquor inlet end opening and a liquor outlet end opening, the protection frame comprises a top plate, a bottom plate and two side plates arranged at the two ends of the top plate and the two ends of the bottom plate, the two side plates are provided with first mounting openings respectively, and a first water inlet is formed in the top plate. The visualization rock plate cover is inserted into the protection frame, a second water inlet is formed in the top of the visualization rock plate cover, the visualization rubber sleeve is inserted into the visualization rock plate cover, and annular space is reserved between the visualization rubber sleeve and the visualization rock plate cover. Sealing covers are arranged on first mounting openings in the two ends of the protection frame and seal the annular space. The acid supply unit is connected with a liquor inlet of the liquor inlet end opening, the pressure supply unit is connected with a second water inlet, and the waste liquor collecting unit is connected with a liquor outlet of the liquor outlet end opening.