The invention discloses a mobile power generation photovoltaic device for power supply. The mobile power generation photovoltaic device comprises a fixed piece, support pieces, connection pieces, a connection plate, power generation photovoltaic assemblies and a control system, wherein a plurality of support pieces are arranged at the top of the fixed piece, the connection pieces are connected with the tops of the support pieces and are horizontally arranged, a plurality of power generation photovoltaic assemblies are arranged on the connection pieces, a first motor is arranged at the bottomsof the connection pieces, an output end of the first motor is connected with a first threaded rod, the first threaded rod is vertically arranged, a bottom end of the first threaded rod penetrates through the connection plate and is connected with a limitation piece, the first threaded rod is in threaded connection with the connection plate, and each power generation photovoltaic assembly comprisesan installation plate, a photosensitive sensor, a photovoltaic panel, a fixed frame, a rotation piece, a gear and a rack. An angle of a photovoltaic panel can be automatically adjusted according to illumination intensity of different directions, and the power generation efficiency is high; and by arranging multiple groups of power generation photovoltaic assemblies, the power generation efficiency is further improved, the device is convenient to move, and the device is relatively stable during the moving process.