The invention provides a steam boiler and a control method of the steam boiler. The steam boiler comprises a boiler body, a door body, a main control board, a display board, an electric energy emitting coil, an electric energy coupling coil, an electric energy conversion circuit, a first controller and a second controller. The electric energy emitting coil is used for emitting wireless electromagnetic wave signals. The electric energy coupling coil is used for receiving the wireless electromagnetic wave signals, and the electric energy conversion circuit is used for converting the wireless electromagnetic wave signals into wireless to be provided for the display board. The first controller is used for controlling the electric energy emitting coil to emit the wireless electromagnetic wave signals when the door body is closed and controlling the steam boiler to perform cooking after establishing communication with the second controller on the door body. The second controller is used for controlling the display board to perform displaying after establishing communication with the first controller. Wireless electric energy transmission between the electric energy emitting coil and the electric energy coupling coil can be used for achieving wireless power supply of the display board, unnecessary cables are reduced, the design is simplified, and the using experience of a user is effectively improved.