A fixing bracket includes a bracket body, at least one connecting rod assembly, and at least one elastic buckling arm. One side of the bracket body has a first pivoting point and a second pivoting point. The at least one connecting rod assembly includes a first rod, a second rod, a third rod. The first rod has a third pivoting point and a fourth pivoting point. The second rod has a first limiting part, a fifth pivoting point, and a sixth pivoting point. The third rod has a second limiting part, a seventh pivoting point, and a eighth pivoting point. The at least one elastic buckling arm is located on the first rod. The connecting rod assembly drives the elastic buckling arm to move between a release position and a fastening position. When located at the fastening position, the first limiting part is against the second limiting part.