Injector capable of being finely adjusted

The utility model discloses an injector capable of being finely adjusted, which belongs to the technical field of injectors and comprises a needle cylinder, a needle head is movably clamped at the bottom of the needle cylinder, a push rod component is arranged in the needle cylinder, the needle cylinder comprises a main body, a threaded groove is arranged at the top in the main body, the push rod component comprises a piston block slidably connected with the inner wall of the main body, and a first bearing is arranged at the top of the piston block. A medicine pushing rod is arranged in the first bearing, a threaded column is arranged in the middle of the medicine pushing rod and is in threaded connection with the threaded groove, and the top of the medicine pushing rod is located on the outer side of the body and provided with an adjusting block; the threaded column is controlled to rotate in the threaded groove through the arranged adjusting block so as to push the piston block, micro-adjustment of the inje