Multi-fuel efficient hot air heating device

The utility model provides a multi-fuel efficient hot air heating device. The multi-fuel efficient hot air heating device is mainly composed of an energy source supply device, a hot air generation device and a variable-frequency fan; the hot air generation device is composed of a box, a combustor, a hot exchange tube, an air inflow fan and a fire grate; the energy source supply device is connected with the energy source inlet of the hot air generation device by use of a pipeline; the variable-frequency fan is connected with the energy source supply device and the combustor in the hot air generation device by use of pipelines, respectively. The multi-fuel efficient hot air heating device has the effects that a plurality of energy sources can be used and the applicability is high, lots of electric energy can be saved for the society, the expenditure of an enterprise and a peasant can be reduced and the production cost can be reduced, and the thermal efficiency is high.