The utility model discloses a sealing device for a
liquid injection tray, which comprises a
processing table, the top surface of the
processing table is connected with a movable base in a sliding manner, the
liquid injection tray is arranged above the movable base, a fixed plate is arranged above the
liquid injection tray, and a plurality of sealing cylinders penetrating through the fixed plate are fixed in the fixed plate. A through hole is formed in the central axis position of the sealing cylinder, the bottom end of the through hole is communicated with a
lithium battery liquid injection position, a liquid
injection port is formed in the top end of the through hole, an opening
rubber sheet is mounted at the liquid
injection port, an opening is formed in the center of the opening
rubber sheet, the opening can be opened when being extruded by external force, and the opening
rubber sheet is in a sealed state when the external force is removed. According to the sealing device provided by the utility model, the sealing cylinder, the opening rubber sheet and other structures are arranged in the fixing plate, so that a closed channel is formed in the liquid injection process of the
lithium battery, the liquid injection in a sealed environment is completed, the liquid injection effect is better, and the
automation degree is higher.