The invention discloses a frame fixing structure for protecting a solar cell panel, and relates to the field of solar cells. The frame fixing structure comprises an X-shaped bracket and right-angle fixing members; the X-shaped bracket is composed of a first frame rod and a second frame rod which are hinged to each other in the middle portion; a plurality of screw holes are formed in front surfacesof the first frame rod and the second frame rod at equal intervals; each right-angle fixing member includes two rods perpendicular to each other, fixing grooves are formed in the centers of one surfaces of the rods, and the fixing grooves of the two rods communicate with each other; fixing cavities and receiving cavities are formed in two sides of the fixing grooves; a plurality of counter boresare formed in two side surfaces of the rods; groove channels are formed in the fixing cavities; and connection rods are arranged in the receiving cavities. In the invention, the right-angle fixing members are fixed on the bottom of the X-shaped bracket, solar cell panels of different sizes are assembled and fixed by fixing the right angle fixing members of different heights in the upper part of the X-shaped bracket through the screw holes, and right-angle fixing members of the two adjacent X-shaped brackets are fixed by the connection rods to improve the fixing strength of the frame.