The invention discloses a track-type automatic drug spraying machine for pig farms. The track-type automatic spraying machine comprises two sliding tracks, a support frame and a drug cylinder; the twosliding tracks are of rectangular columnar structures and are symmetrically distributed with a captivity surrounding wall as a center, the lower end of each sliding track is provided with a fixing block, the fixing blocks are matched with reserved grooves formed in the surface of the captivity surrounding wall, and fixing holes are formed in the fixing blocks and internally provided with long-rodpins; the plate surface of each fixing block is provided with a sliding groove, the sliding grooves are matched with sliding wheels arranged at the bottoms of support legs, anti-deviation sleeve plates are fixedly connected to the rod bodies of the support legs, a sliding block is arranged on the bottom surface of each anti-deviation sleeve plate, the sliding blocks are matched with limiting grooves formed in the plate surfaces of the fixing blocks, and the tops of the support legs are fixedly connected to the bottom surface of the support frame; the end portion of a drug distribution pipe isprovided with an adjustment handle, and when the adjustment handle is rotated, a sprayer is driven to rotate to adjust the drug spraying direction and angle.