A stable visual panel fixing device comprises a panel framework (6) and a fixed connection plate (8), wherein the fixed connection plate (8) is fixedly connected with a fixed body, an inclined upwarp part (61) is fixedly arranged at a back side of the panel framework (6) and downwards protrudes from a framework body in an inclined way, an inclined surface at a bottom side of the inclined upwarp part (61) deviates from the framework body to form an angular suspension part to be matched with an inclined surface of an upper side of a tail-end upwarp part (891) of a support plate (89) fixedly connected with the fixed connection plate (8) so as to form inclined-surface support matching (892), the fixed connection plate (8) is provided with a fastening support strip (81) fixedly arranged above the support plate (89), a fastening part (7) is fixedly arranged at the back side of the panel framework (6) and is used for being positioned above the fastening support strip (81) so that the positioning post (72), deviating from the fastening part (7), on the fastening part (7) is matched with a corresponding positioning hole formed in the fastening support strip (81).