The invention discloses a spring bag opener, which comprises a fixed crossbeam and bag-opening assemblies. Each bag-opening assembly comprises a fixed round tube and a floating round tube, one end of the fixed round tube is fixed in a mounting hole, the interior of the fixed round tube is provided with a cavity which axially runs through, the fixed round tube is provided with an upper slotted hole and a lower slotted hole, the floating round tube is mounted in the cavity of the fixed round tube, and the top surface of the floating round tube is provided with a slotted hole matched with the upper slotted hole; a slider is arranged at one end of the floating round tube, a bag-opening bolt is mounted on the slider, the bag-opening bolt sequentially upwardly passes through the slotted hole and the upper slotted hole, and a limit screw is mounted in the lower slotted hole of the fixed round tube; a bag-opening compressed spring is also arranged in the floating round tube, one end of the bag-opening compressed spring abuts against the slider, the other end of the bag-opening compressed spring is limited by an internal limit structure of the floating round tube, and a bag-opening hook is fixed on the end part of the other end of the floating round tube.