Touch push button type switch

The utility model provides a touch push button type switch, belonging to the technique field of a touch switch, particularly to replace the push button of common machinery used in mass powder dust environment. The switch resolves the problem of short service life of the push button in the powder dust environment. The switch comprises a push button casing, the top of the push button casing has a metal touch piece, at least two power input pins and a signal output pin are arranged on the push button casing, a amplifying circuit which is connected with the metal touch piece, the power supply pins and the signal output pin for outputting the metal touch piece connecting state from the signal output pin after signal amplification is arranged in the push button casing. When used, after the finger touches the metal touch piece, the amplifying circuit in the push button casing amplifies the signal induced by the metal touch piece, then the signal is output from the signal output pin, for providing control signal to t