Fabricated building photovoltaic roof and use method

A fabricated building photovoltaic roof disclosed by the present invention comprises a mounting box, an adjusting device, a driving device, a motor, a mounting frame and a connecting rod, the adjusting device comprises a threaded sleeve, an adjusting seat and an adjusting screw rod, the driving device is used for driving the threaded sleeve to rotate, and the motor is used for providing power for the driving device; according to the invention, free assembly can be realized, so that the installation number of the photovoltaic panels can be adjusted according to the size of a roof or customer needs, on one hand, the installation of the photovoltaic panels is more convenient, and on the other hand, the installation number of the photovoltaic panels can be flexibly adjusted; components such as the mounting box, the mounting frame and the connecting rod can be disassembled and assembled mutually, so that material carrying is more convenient, after the mounting box is assembled, all the driving devices are also lin