Accessory used for infusion bag

The invention discloses an accessory used for an infusion bag. The accessory comprises an accessory pipe and a gasket arranged on the upper portion of a pipe cavity of the accessory pipe. A seal cover used for sealing an end opening of the accessory pipe is arranged at the upper end opening of the accessory pipe, and comprises a pull cover and a pressing ring, the pull cover and the pressing ring are formed integrally, and the pressing ring comprises a pressing disc used for welding and pressing pins used for pressing the gasket and arranged at the bottom of the pressing disc. After the pressing disc and the upper end opening of the accessory pipe are fixedly welded, the pressing pins extend into the pipe cavity and are pressed on the upper surface of the gasket to press and fix the gasket. The accessory can be used for adding medicine and achieving infusion. According to the integral structure, the accessory is beneficial to sealing the pipe without welding the seal cover in the production process of the infusion bag, the welding processes are reduced, and the risk of polluting the medicine liquid by secondary welding is reduced; through arranging the pressing ring on the gasket, the installing firmness of the gasket is effectively improved, and it can be effectively avoided that in the using process, because the gasket loosens, the liquid leaks.