The present disclosure provides a material cleaning device and a cooking appliance: The device includes a cleaning cavity, a material transport pipe, a cleaning inlet pipe and a cleaning and sealing assembly. The upper part of the cleaning cavity is provided with a material feeding port and an air inlet; the air inlet is used for transporting an air flow to the cleaning cavity to assist in material discharging; the cleaning inlet pipe is able to be connected to a water source and an air source, the cleaning and sealing assembly is provided at a material discharging port and is connected to the cleaning inlet pipe so as to open or close the material discharging port under the driving of the cleaning inlet pipe; and the cleaning and sealing assembly is provided with a transport hole in communication with an output end of the cleaning inlet pipe and the inner space of the cleaning cavity.