An installation assembly for a photovoltaic module comprises a base plate, a pressing block, a elastic member, and a connecting member. The base plate comprises a connecting portion. The pressing block comprises a pressing portion, a supporting portion, and a sliding portion. The sliding portion is movably connected to the base plate. The elastic member is located between the connecting portion and the supporting portion. The connecting member sequentially inserted into the pressing block, the elastic member, and the base plate. The pressing block, the elastic member, and the base plate are positioned between two ends of the connecting member.