Small animal subcutaneous mass extraction controller

The invention discloses a small animal subcutaneous mass extraction controller, which comprises a syringe barrel body, a piston body, a piston rod, a rear seat and a syringe needle. The syringe needleis fixedly installed at the front end of the syringe barrel body, the syringe barrel body internally sleeves thepiston bodyin a matched mode, the piston rod is fixed to the rear end of the piston body, the rear seat is located at the rear end of the piston rod, the axial center positions of the piston body and the piston rod are of an integral hollow structure and used as a central hole, the rearend of the central hole is sealed by the rear seat, a needle tubing and the central hole internally sleeve the core rod, the core rod comprises a fine diameter segment and a coarse diameter segment,the needle tubing internally sleeves the fine diameter segment in a matched mode, the central hole internally sleeves the coarse diameter segmentin a matched mode, and a block stop part for limiting excessive backward movement