The invention discloses a base component of a dishwasher. The base component comprises: a base that defines a floater cavity; a floater arranged in the floater cavity and floating with changes in theliquid level in the floater cavity; a cover that covers the floater and positioned in the floater cavity, wherein the cover is provided with a water inlet communicated with the floater cavity; a protective switch arranged on the cover, wherein the floater floats between a float-up position to open the protective switch and a sink position to close the protective switch. The base component according to the invention has the advantages that when liquid in a dishwasher overflows, the floater rises from the sink position to the float-up position under the buoyant action of the liquid, the protective switch is switched from the closed state to the opened state, a warning is given out to remind a user of taking timely measures, damage to the dishwasher is avoided, the service life of the dishwasher is thereby extended, and operating stability of the dishwasher is improved.