The invention provides an anti-abrasion stopper rod water gap quick changing device. The anti-abrasion stopper rod water gap quick changing device comprises a lengthened water gap, wherein a water gap positioning hole is formed in the lower part of the lengthened water gap; the lower part of the lengthened water gap is matched with an installing plate; the lower part of an upper water gap is arranged in an upper guiding plate; the bottom surface of the upper guiding plate is provided with a lower guiding plate; a gas spring is arranged on the lower guiding plate; the bottom part of a lower water gap is arranged in an upper end opening of a submersed water gap; the shape of the upper part of the submersed water gap is a cone; the shape of the lower part of the submersed water gap is a cylinder; the bottom surface of the lengthened water gap is in contact with the upper surface of the upper guiding plate; an upper end opening of a first through hole in the lengthened water gap is matched with a zirconium head arranged at the bottom end of a stopper rod body; a cylindrical through hole is formed in the center part of the submersed water gap; a conical through hole is formed in the center part of the cone; an annual groove is formed in the inner wall of a through hole in the upper end part of the submersed water gap; a cylindrical zirconium cylinder is arranged in the annual groove; the upper end of the cylindrical zirconium cylinder is in contact with the small-diameter end of a conical zirconium cylinder. According to the anti-abrasion stopper rod water gap quick changing device provided by the invention, the positioning accuracy is high while a water gap is changed, and convenience and quickness are realized.