The invention relates to the technical field of photovoltaic power generation, and discloses a reflection mechanism for a photovoltaic power generation device. The reflection mechanism comprises a base, and the top of the base is rotatably connected with a reciprocating screw rod. The reciprocating screw rod is arranged at the center position of the base, and the bottom of the reciprocating screwrod penetrates through the side wall of the base and extends outwards. The bottom of the reciprocating screw rod is fixedly connected with a first bevel gear in a sleeved mode, and the bottom of the base is fixedly connected with a low speed motor. The output end of the low speed motor is fixedly connected with a second bevel gear in a sleeved mode, and the second bevel gear and the first bevel gear are arranged in a meshing mode. Invgorating sliding block nuts are further arranged on the rod wall of the reciprocating screw rod, and the invgorating sliding block nuts are movably connected withthe reciprocating screw rod. Two movable plates are further arranged above the base, and the two movable plates are symmetrically arranged relative to the reciprocating screw rod. The angle of a reflector can be adjusted according to the illumination angle of sunlight, so that the illuminated face of the photovoltaic power generation can better receive the sunlight, and the effect of the photovoltaic power generation is improved.