Prestressed connecting device for shear tooth end of precast pile

The utility model relates to a prestressed connecting device for a shear tooth end of a precast pile. Comprising reinforced concrete precast pile sections (1), cementation shear key teeth (2), cementation shear key grooves (3), prestressed ducts (4), prestressed steel bars (5), high-performance cement paste (6) and cementing agents (7). The utility model is characterized in that: 1, the cementing agent (7) is coated on the surfaces of the cementing shear key teeth (2) and the cementing shear key grooves (3), the cementing agent (7) not only plays a role in cementing, but also plays a role in preventing water in a use stage, so that the durability and the integrity of a pile foundation connecting part are greatly improved, and the cementing shear key teeth (2) and the cementing shear key grooves (3) at the pile end not only have an anti-shearing function, but also have a waterproof function; and the positioning effect can be achieved when the mutually matched precast pile sections are connected. 2, the number