The invention relates to a subway automatic ticket vending machine. The subway automatic ticket vending machine comprises a cabinet, a payment device and a PLC (Programmable Logic Controller) respectively mounted on the cabinet and electrically connected to each other, and further comprises a first inclined rail, a guide rod, a sleeve, a first air cylinder, a second air cylinder and a push plate.Cross section of the first inclined rail is circular and the lower end opening edge of the first inclined rail has a vertical guide hole; the guide rod pass through and is slidably connected to the vertical guide hole; diameter of the sleeve is equal to a sum of length of the guide rod and the diameter of the first inclined rail; an end opening of the sleeve is disposed opposite to a lower end opening of the inclined rail and an edge top of the end opening is connected to a top of the guide rod; a first push rod of the first air cylinder is vertically upward disposed; the second air cylinder is horizontally fixed to the first push rod and the second push rod of the second air cylinder towards the the other end opening of the sleeve; the push plate is vertically fixed to the second push rodand the push plate is located in cylindrical cavity of the sleeve; the first air cylinder and the second air cylinder are electrically connected to the PLC.