The invention relates to a sucker type knob switch for an electrical appliance, and aims to realize that the knob can be removed based on the sucker principle. When the sucker type knob switch is used, the knob is fixed on the panel, and when the sucker type knob switch is cleaned, the knob is removed to facilitate cleaning, so that the electrical appliance is cleaner, more sanitary, water resistant and oil resistant. In the technical scheme, the knob switch consists of a knob component, a control panel and a signal sensing component, wherein the knob component is arranged on the control panel in a removable way, and the signal sensing component is arranged under the control panel, the knob component comprises a soft sucker corresponding to the control panel, the center of the sucker is fixedly connected with a screw, a matching T-shaped nut is arranged outside the screw, a support cap and a knob cap are sleeved outside the cylindrical body of the nut in sequence, and a group of signal transmitters are arranged in the knob cap; and the signal sensing component is provided with a group of signal sensing elements. The invention is applicable to the technical field of household electrical appliances, in particular to electrical heating appliances such as induction cookers, electrical heating stoves and the like.