The invention discloses a modular decorative wall surface structure convenient to install, and relates to the technical field of decorative wall surface installation. The modular decorative wall surface structure convenient to install comprises an inner wall, a mounting plate and a decorative wallboard; a sliding rod is arranged on the inner side wall of the inner wall, a mounting column is slidably connected to the side wall of the inner wall, one end of the mounting column penetrates through the inner wall and is fixedly connected with a pressing block, a pressing spring is arranged on the inner side wall of the inner wall, and the other end of the mounting column extends into a mounting plate; an inner groove is formed in the portion, extending into the mounting plate, of the mounting column, a sliding groove is formed in the mounting plate, a clamping block is slidably connected into the inner groove, the clamping block extends into the sliding groove, an ejection block is slidablyconnected into the sliding groove, a telescopic spring is arranged on the inner wall of the inner groove, a wedge-shaped block is slidably connected to the outer surface of the sliding rod, and a sliding column is slidably connected to the side wall of the inner wall; one end of the sliding column penetrates through the inner wall and is fixedly connected with an extrusion block, and outer surface of the part, extending into the inner wall, of the sliding column is sleeved with an extrusion spring. According to the modular decorative wall surface structure convenient to install, and the problem that an existing decorative wall surface is difficult to disassemble and assemble is solved.