Hot melting welding construction method for tunnel rubber waterstop

According to the tunnel rubber waterstop hot melting welding construction method, the ends of the two waterstops to be connected are treated to form lap joint parts so that connection can be facilitated, the components of raw rubber sheets are similar to the rubber components of the waterstops, heating and pressurizing can be conducted through a vulcanization welding machine, the lap joint parts can be promoted to be connected into a whole, and the construction efficiency is improved. The auxiliary butt joint device is arranged, a position adjusting space is formed on a base plate in the auxiliary butt joint device and used for placing the end of the water stop belt, the position of the water stop belt is arranged in cooperation with a movable pressing plate, the water stop belt in the horizontal direction or the annular direction can be aligned and compacted in advance, and the auxiliary butt joint device can also serve as a supporting structure for a vulcanization welding machine during construction of the