The invention discloses a photovoltaic assembly protecting device convenient to mount. The photovoltaic assembly protecting device comprises a base, a placement frame, an electric push rod, a fixed rod, a support plate, a vertical rod, a draining slot, a cover plate, first rotating rods, fixed rods, connecting rods, second rotating rods, a fixed frame, a solar panel, pulleys, first springs, limiting rods, screw rods, second springs and a push plate. The photovoltaic assembly protecting device is simple in structure and convenient to operate; the solar cell can be flatly spread through the rotation of the rotating rods, so that the absorption of optical energy is promoted; after the cover plate is opened, light is reflected to the solar panel through a light reflection mirror, so that the conversion efficiency of the optical energy is improved; and by utilizing a folding manner, the solar panel is not corroded by rainwater in severe weather; by virtue of the sliding connection between the fixed frame and the placement frame, the mounting of the solar panel is promoted; and by virtue of the elastic potential energy of the springs, the damage caused by shaking to the solar panel is avoided, and the buffering and damping effects are achieved, so that the normal work of the solar panel is promoted.