Solar advertising board mounting device with angle adjusted pneumatically

A solar advertising board mounting device with the angle adjusted pneumatically comprises an advertising board bearing frame (3) as well as a jack type fixing assembly fixedly embedded in a building wall, wherein the front side plate of the advertising board bearing frame (3) is used for mounting of an advertising board, a cavity is formed in the advertising board bearing frame (3), a positioning plate (31) is fixedly arranged in the cavity and used for limiting the retraction position of a retractable fixing column (4) glidingly arranged in a back side plate of the advertising board bearing frame (3), and a pressing spring (42) is arranged in the cavity and used for pressing the retractable fixing column (4) towards the positioning plate (31) so as to enable the retractable fixing column (4) to be in the retraction position.