The utility model discloses a photovoltaic assembly installation clamp. Bracket and clamping piece, the clamping piece is provided with an installation groove, a stress cable is installed in the installation groove, one end of the support abuts against one side of the stress cable, transverse plates are fixed to the two sides of the support, frames are arranged on the two sides of the support, openings are formed in the frames, notches are formed in the two frames, and photovoltaic module bodies are arranged in the two notches in a penetrating mode. According to the utility model, a problem that elastic connection between the photovoltaic assembly and the support can not be realized is solved; the problem of inconvenience in mounting and dismounting is also solved; the spring is arranged between the photovoltaic module and the mounting clamp, so that the photovoltaic module and the mounting clamp are elastically connected, the risk that the photovoltaic module is prone to subfissure due to the fact that the force-bearing cable shakes under the action of wind load is avoided, the power loss of the photovoltaic module is reduced, the generating capacity is improved, and the economicbenefit is increased.