The invention relates to a roof all-environment applicable fan device and system, which comprises a mounting frame, a plurality of air deflectors, a generator, a noise reduction case, a magnetic suspension electric suction assembly and a heating and deicing assembly, the noise reduction case is mounted in the mounting frame, the generator is fixedly mounted in the noise reduction case, a first flange is mounted on an output shaft of the generator, and a second flange is mounted on the output shaft of the generator. The magnetic suspension electric suction assembly is installed on the installation frame, a bearing seat is installed on the installation frame, a rotating shaft is rotationally arranged in the bearing seat, a second flange is fixed to one end of the rotating shaft, a third flange is fixed to the other end of the rotating shaft, and the air guide plate is installed between the first flange and the second flange and provided with a cyclone adjusting opening. The cyclone adjusting port is provided with a cyclone adjusting blade, the noise reduction case and the mounting frame are provided with a heating and deicing assembly, and the mounting frame is provided with an induction lightning rod, so that the device has the advantages of direct lightning stroke prevention, safety protection, noise pollution prevention and freeze injury prevention, and breaks through the bottleneck that the installation of a fan on a building roof is limited due to potential safety hazards.