The invention relates to a chlorine introducing method and a chlorine introducing device, in particular to a chlorine introducing method and a chlorine introducing device for producing stannous chloride by liquid chlorine. The method comprises the following steps of: introducing liquid chlorine into a coiled tube to be heated and gasified, introducing chlorine to a chlorine introducing tank for use, and heating the coiled tube by external hot water at the temperature of between 40 and 60 DEG C. The device comprises a liquid chlorine cylinder, the toiled tube, a heating water tank and a chlorine buffer tank, wherein the coiled tube is arranged in the heating water tank; an inlet of the coiled tube is communicated with the liquid chlorine cylinder, and an outlet of the coiled tube is communicated with the chlorine buffer tank; and the chlorine buffer tank is communicated to the chlorine introducing tank. In the method and the device, an operating mode of the natural gasification of the liquid chlorine is changed, and the liquid chlorine is introduced into the coiled tube in liquid mode and is heated by utilizing the coiled tube to accelerate the gasification speed of the liquid chlorine and improve the efficiency of a chlorination reaction in stannous chloride production; and the requirement of the production on the speed of a chlorine introducing reaction can be met only by opening one cylinder of liquid chlorine (one ton/cylinder), and the reliability of safety performance of the liquid chlorine during use is enhanced.