The invention relates to the technical field of valves, in particular to a soft seal type butterfly valve with an outrushing-preventing structure. The soft seal type butterfly valve comprises a valve body, a replaceable rubber valve seat, a valve plate, an upper valve shaft and a lower valve shaft, wherein replaceable rubber valve seat and the valve plate are in interference fit with the valve body, and the upper valve shaft and the lower valve shaft are installed at the two ends of the valve plate respectively. A locating step is arranged at the end of the upper valve shaft and is matched with a gland fixed to the upper part of the valve body. According to the soft seal type butterfly valve, the locating step is designed at the upper part of the upper valve shaft, the gland can be clamped on the locating step, and therefore the outrushing preventing effect can be realized through the design of the gland; and taper pins do not need to be installed, the process is eliminated, the assembly efficiency of the valve is improved through the design of the gland, the skill requirements for workers to drill holes of the taper pins are lowered, the production efficiency is improved, the technical requirements for the workers are lowered, and therefore the production cost of products is lowered.