The invention provides a two-position three-way valve which comprises a valve body (1), a valve core (2) and a plug (6); the valve body (1) is provided with a valve cavity (11); the side wall of the valve body is provided with an air outlet (B) communicated with the valve cavity; the valve core (2) extends into the valve cavity from one end and can move along the axial direction of the valve body; part of the valve, which protrudes out of the valve body, is provided with a plurality of vent holes (C), and the vent holes (C) can be communicated with the valve cavity through connection channels(21) in the valve core; the plug extends into the valve cavity from the other end, and is provided with an air inlet (A) communicated with the valve cavity, wherein a single-way valve gasket (5) is arranged between the plug and the valve core, so as to selectively communicate the air inlet and the air outlet or communicate the air outlet and the vent holes; the two-position three-way valve of theinvention can be combined into a gas-electric linkage switch with the power switch of an anesthesia machine, not only has good air-tightness, smaller size and low compression resistance, and can ensure the hand feel of the gas-electric linkage master switch.