The invention discloses a pre-reactor main shaft spiral system for hydrogen fluoride. Fluorite charging section blades are welded on a fluorite charging section shaft sleeve; reaction section blades are welded on a reaction section shaft sleeve; extension section blades are welded on an extension section shaft; the length is greater than 5 meters; the extension section blades, fluorite charging section blades and reaction section blades are respectively welded with a stellite alloy in an overlay welding mode; the pitch between the reaction section blades and the blades at the acidification port is increased; a 130-145mm-long spiral short section is added to the tail end of the main shaft, so that the acidification port deviates from the spiral junction surface by 180-200mm; the fluorite charging section blades and fluorite charging section shaft sleeve are made of the same material; and the reaction section blades and reaction section shaft sleeve are made of the same material; and the extension section blades and the extension section shaft are made of the same material. The system has the advantages of sufficient reaction, no blocking, no material return, favorable abrasion resistance, low failure rate, long equipment life and high yield, and is suitable for delivering slurry and lumping materials as well as high-abrasion materials.