A non-contact touch switch comprises an outer cover installed at an outlet of an AC power source, a microcomputer control circuit installed on an inner side of the outer cover, a medium transferring interface installed on the outer cover and connecting with the microcomputer control circuit, a start switch with one end thereof being connected with the microcomputer control circuit and another end thereof being disposed with a control contact connected to the power source so as to control electrifying time of an electrical device connected therewith, and a power interceptor disposed between the microcomputer control circuit and the start switch capable of directly intercepting, rectifying, and stabilizing an external power supply as a power supply available for a normal operation of an internal circuit.