Adjustable scarifier support, scarifier and bulldozer

The utility model relates to the field of self-propelled shoveling and transporting earthmoving machinery, and discloses an adjustable scarifier support, a scarifier and a bulldozer, the scarifier support comprises a supporting seat, an oil cylinder seat is arranged in the middle of the supporting seat, and connecting rod seats are arranged on two sides of the supporting seat; an oil cylinder connecting hole used for being connected with an oil cylinder is formed in the oil cylinder base, a first connecting rod connecting hole is formed in one end of the connecting rod base in the vertical direction, and at least two second connecting rod connecting holes are formed in the other end of the connecting rod base. The scarifier support is connected with the rear-end scarification portion of the scarifier through the upper connecting rod, the lower connecting rod and the oil cylinder, a plurality of installation positions can be provided for the front end of the upper connecting rod or the lower connecting rod, an