The invention discloses an assembly grinding tool for wire molding. The assembly grinding tool comprises a working platform. The upper end of the working platform is provided with a gantry bracket, the upper end of the working platform is provided with a conveyor belt, the upper end of the gantry bracket is provided with a piston pressing rod, the lower end of the piston pressing rod is connectedwith a rubber pressure wheel, and side edge grinding tools are arranged on the two sides of the conveyor belt; each side edge grinding tool includes a casing, an upper pressing plate and a lower pressing plate are mounted on each casing, a grinding tool opening is arranged between each upper pressing plate and the corresponding lower pressing plate, the inside of each casing is provided with a grinding plate inserting slot, and a grinding plate is inserted into each grinding plate inserting slot and is fixed in the grinding plate inserting slot through a locking bolt; and each lower pressing plate is provided with a hopper-shaped chipping leakage hole, and the lower end of the chipping leakage hole is in threaded connection with a chipping bottle. The high-efficiency grinding effect is kept by conducting grinding operation on the grinding plates and by adjusting the positions of the grinding plates, it is avoided that the surface is rubbed down due to grinding on a certain part for a long time, the grinding efficiency is improved, and the assembly grinding tool is worth of popularization.