The invention discloses a machining process of toothed bars of a scarifier. The machining process includes the following steps: S1, raw materials of the toothed bars are obtained after discharging; S2, press working is carried out on toothed tips of the raw materials of the toothed bars to obtain workblanks of the toothed bars, and the fiber texture direction of the toothed tips accordingly extends in the extending direction of shearing stress faces of the toothed tips; S3, heat treatment is carried out on the workblanks of the toothed bars to obtain toothed bar parts. According to the machining process, the press working mode is adopted, the fiber texture direction of the toothed tips accordingly extends in the extending direction of the shearing stress faces of the toothed tips, when the toothed bars machined in the mode work, the direction of the shearing stress borne by the toothed tips of the toothed bars is approximately perpendicular to the fiber texture direction of the toothed tips, the shear stress resistance capacity of the toothed tips is accordingly improved, the toothed tips of the toothed bars are not prone to being damaged, and the service life of the toothed bars is accordingly prolonged. The invention further discloses the toothed bars of the scarifier and a bulldozer.