The invention relates to the technical field of seeding, and discloses an astragalus seeding machine, which comprises a frame, wherein a seeding pipe is fixedly connected on the frame; a feeding holeis arranged on the seeding pipe; the seeding pipe is threaded with a plowing rod; a drill bit is arranged on the plowing rod; the drill bit comprises two drill plates hinged at the end part of the plowing rod; the end parts of the two drill plates are butted against each other, and a wedge block is hinged at the end part of the seeding pipe; a cavity is formed in the plowing rod, a through hole isformed in the plowing rod, a water tank and a piston cylinder are fixedly connected on the frame, a piston is slidably connected in the piston cylinder, a piston rod is fixedly connected on the piston, the plowing rod is provided with a sliding groove in the axial direction of the piston rod, the end part of the piston rod is slidably connected in the sliding groove, an air bag is fixed on the frame, a pressure valve is arranged between the air bag and the seeding pipe, one side of the piston cylinder communicated with the water tank is communicated with the cavity, the other side of the piston cylinder is communicated with the air bag, and a first one-way valve is arranged between the piston cylinder and the air bag. According to the invention, the plowing, fertilizing and watering can be carried out before seeding, and favorable conditions for the growth of the seeds are improved.