Protective mechanism for needle withdrawal in port of infusion

The protection mechanism comprises a needle withdrawing sleeve, the upper end and the lower end of the needle withdrawing sleeve are of an open structure, a double-layer track is arranged on the inner wall of the needle withdrawing sleeve, two needle withdrawing pincers which are staggered with each other are arranged in the double-layer track, a protection sleeve is arranged at the lower end of the needle withdrawing sleeve, and the needle withdrawing pincers are arranged on the protection sleeve. A clamping protruding ring is arranged on the inner wall of the protective sleeve, the needle pulling forceps comprise forceps pieces, moving wheels are arranged at the two ends of each forceps piece, needle pulling baffles are arranged on the forceps pieces, a V-shaped opening is formed in one end of each forceps piece, and a needle head fixing groove is formed in each V-shaped opening. When the infusion port needle is pulled out, the needle head of the infusion port is clamped from the two ends, the vertical need