It consists of a clamping rod, a V-shaped clamp, a clamping ring, and a clamping head, and V-shaped grooves are carved in three directions of the clamping head to facilitate the clamping and guiding of the injection needle or electrode. It is used for micro injector drug delivery experiments, and can simultaneously fix the syringe barrel and needle, making the clamping of the syringe more stable. The clamping range of the syringe barrel is 3mm-12mm, and the clamping range of the syringe needle is 0.3mm-1.5mm.