TOUCH FREE AUTOMATIC TYPE WATER SUPPLY DEVICE AND SPARE PART SYSTEM THEREOF

A touch free automatic type water supply device is adapted to be installed at a faucet. The faucet includes an outlet. The touch free automatic type water supply device includes: a shell including an inlet, a flow channel and an outlet, wherein the inlet of the shell is adapted to be communicated with the outlet of the faucet; a control circuit adapted to sense an external object and then to generate a control signal; and a driving unit, whose an end is disposed in the shell, and is physically connected to an end of the flow channel, wherein the driving unit is electrically connected to the control circuit for controlling water flow rate of the outlet or automatically switching on/off water supply of the outlet according to the control signal.