The present invention relates to a cooking device comprising a coupling housing having a detachable vessel with a detachable pulverizing blade, a screen formed on its lateral surface, a handle grip with a coupling point of contact, a sensor and a plate type of a heater on which a plurality of heat bands are installed to adjust the caloric value; a base coupled to the lower part of the coupling housing with a motor and a controller; a coupling part coupled to the handle grip with the coupling groove which has an electric point of contact to be connected the coupling point of contact; and a sensor control circuit having an input circuit to receive electric signals generated from two electrodes, a control circuit to control the operation of electric devices connected to an output circuit with the electric signals from the input circuit, and a safety circuit to check the operation of the control circuit.