A liquid supply system of dental handpiece mainly comprises one, two or more than two liquid supply devices, an air intake tube, a liquid intake tube and a flow control valve. The air intake tube delivers compressed air transmitted by the dental handpiece connector to the liquid supply devices, such that the pressure increased by the compressed air in the liquid supply devices can discharge liquid contained therein through the liquid guide tubes, and then a flow switch can perform the switching of connection with one of the liquid guide tubes of the liquid supply devices, enabling the flow control valve to control the flow of the liquid which flows via the liquid intake tube to the handpiece connector, so as to allow the dental handpiece to arbitrarily switch between different liquids of interest.一種牙醫手機供液系統,其主要包括一個、兩個或兩個以上之液體供應裝置、一進氣導管、一進液導管及一控制水流閥,該進氣導管為輸送牙醫手機連接器所傳輸之壓縮空氣至該等液體供應裝置內,並利用液體供應裝置內部因壓縮空氣的增加而增加之壓力,迫使內部所盛裝之液體藉由導液管流出,然後以水流切換器切換與各液體供應裝置的導液管其中之一連通,令所欲使用之液體經由控制水流閥控制流量大小,並由進液導管流至牙醫手機連接器,而達到供應牙醫手機任意切換使用不同液體之目的。1‧‧‧液體供應裝置11‧‧‧洩壓閥12‧‧‧容器空間13‧‧‧導液管2‧‧‧進氣導管21‧‧‧三通接管3‧‧‧進液導管31‧‧‧氣動控制閥4‧‧‧控制水流閥5‧‧‧牙醫手機連接器51‧‧‧出氣通道52‧‧‧進液通道6‧‧‧逆止閥
