Device for heating foods by using pressure steam and using method

The invention relates to a device for heating foods by using pressure steam. The device comprises an underframe, a cover plate and a water purification box which is installed on the underframe and connected with an external water pipe; the device is characterized by further comprising a steam pressure tank which is connected with the water purification box, a steam heating box which is connected with the steam pressure tank, a waste water collection box which is connected with the bottom of the steam heating box, a containing basket used for inserting the foods into the steam heating box, anda control system; the steam heating box comprises a steam buffer box body, a steam guide pipe and a pressure sensor I, wherein the steam guide pipe is connected with the steam buffer box body and an inner cavity of the steam heating box, and the pressure sensor I is used for detecting whether the containing basket is placed in the steam heating box or not. The device has the advantages that efficient food heating requirem