The invention discloses a photovoltaic module fixing structure and a photovoltaic support, comprising a support; A pressure plate of the photovoltaic module is arranged on one side of the support andis axially connected with the top end of the support; A guide fastener, one end of the guide fastener is fixed in the clamping groove and the other end of the guide fastener is clamped in the mountingposition when the pressure plate of the photovoltaic module is pressed on the surface of the previous photovoltaic module; And an overturned self-pressing plate located on the other side of the support and axially connected to the top end of the support, wherein the overturned self-pressing plate has a crimping surface and an abutting surface, wherein the crimping surface can be pressed against the surface of the rear photovoltaic module, and the abutting surface is abutted against the side surface of the rear photovoltaic module. Compared with the prior art, the photovoltaic module fixing structure in the invention can realize the fixing of the edges of two photovoltaic modules, and when the photovoltaic module is fixed, the photovoltaic module can be directly pushed in to complete the fixing, and the installation efficiency of the photovoltaic module can be effectively improved.