Plastic packaging bag with tying function

The utility model discloses a plastic packaging bag with a tying function, which belongs to the technical field of plastic packaging bags and comprises a packaging bag and a fixing ring, the fixing ring is arranged on the packaging bag, a fixing belt is fixedly connected in the fixing ring, a fixing shell is arranged on the packaging bag, and the fixing shell is fixedly connected with the fixing belt. And the other end of the fixing belt penetrates through the fixing ring and the fixing shell and is connected with a connecting block, conical blocks are adjustably connected to the two sides of the fixing shell, and a fixing toothed plate is arranged in the fixing shell. Under the combined action of a sliding rod, a round hole, a conical block, a first spring, a telescopic assembly, a connecting rod and the like, by pressing the sliding rod, the sliding rod can drive the conical block to extrude the connecting rod, so that a fixing toothed plate and a fixing belt are not fixed any more, and the position of the