The utility model relates to a lactide feeding system. The lactide feeding system comprises a hopper; the spiral feeder is provided with a feeding port and a discharging port, and the feeding port iscommunicated with the bottom of the hopper; a feeding port of the melting tank is communicated with a discharging port of the spiral feeder, and an air inlet is further formed in the melting tank; andnitrogen in the nitrogen source enters the melting tank through the gas inlet. According to the lactide feeding system, the nitrogen source is additionally arranged at the position of the melting tank, so that the internal space of the lactide feeding system is isolated from outside air and moisture under the protection of nitrogen, lactide is slightly influenced by the environment in the conveying process, and the quality of lactide is still guaranteed under the condition that dehydration treatment procedures are reduced.