The micro precise liquid feeding device comprises an injection cylinder and an electric cylinder, the injection cylinder comprises a cylinder body, a push rod and a needle.The discharge port of the barrel body is provided with a one-way discharge check valve.The feed inlet of the barrel body is provided with a one-way feed check valve.When the push rod is lowered, the one-way discharge check valve will make the liquid raw material in the barrel flow out of the discharge port in one way.The one-way feeding non-return valve can only send the raw material into the barrel in one-way when feeding.The opening pressure of the one-way discharge check valve is greater than that of the one-way feed check valve.So that the check valve will not be opened when feeding from the check valve.An exhaust overflow port is provided on one side of the barrel.The push rod is inserted in the barrel to push the material in the barrel.The needle is connected with the discharge port of the barrel body.The electric cylinder can drive the push rod to move up and down precisely.When there are too many raw materials fed into the feed port or there is air in the raw materials, it can be led out from the exhaust overflow port；With this system, the injection volume of liquid can be accurately controlled to improve the quality.It can save manpower and improve work efficiency.一種微量精確給液裝置，包括一注射筒及一電動缸，該注射筒包含一筒身、一推桿及一針頭。該筒身的出料口中設有一單向出料逆止閥，該筒身的入料口中設有一單向入料逆止閥，該單向出料逆止閥在該推桿下降時才會使該筒身之中的液體狀原料單向的由該出料口流出，該單向入料逆止閥在入料時才會使原料單向的送入該筒身之中，該單向出料逆止閥的開啟壓力大於該單向入料逆止閥，以使由該單向入料逆止閥入料時該單向出料逆止閥不會被開啟，於該筒身的一側設有一排氣溢料口，該推桿係插設於該筒身之中可推擠該筒身中的原料，該針頭結合在該筒身的出料口上，該電動缸可驅動該推桿精確的昇降作動，當該入料口送入的原料過多或原料裏有空氣時則可由該排氣溢料口導出；藉此係可精準的控制液體的注射量以提高品質，並可大幅節省人力與提昇工作效率。
