The invention discloses a key switch of a vending machine. The key switch comprises a switch main body and a control mechanism; a control area is fixedly arranged on the outer surface of the front endof the switch main body; keys are fixedly arranged on the outer surface of the front end of the control area; a spring rod with a hook is movably arranged on the outer surface of one side of the switch main body; a coin channel is formed in one side of the inner surface of the switch main body; the control mechanism is fixedly connected to the lower end of the inner surface of the switch main body; a recognizer is fixedly arranged on the outer surface of the front end of the control mechanism; and a memorizer is fixedly arranged on the outer surface of one side of the recognizer. According tothe key switch of the vending machine, fixing blocks, the recognizer and cables are arranged so that individual keys which are damaged can be independently replaced, the coin-input and goods-output functions are integrated into a whole, the height of the key switch can be controlled according to the requirements of people with different heights, and the key switch is suitable for different working conditions and brings a better application prospect.