PICC catheterization ultrasonic puncture positioning device and system

The invention relates to a PICC catheterization ultrasonic puncture positioning device. The PICC catheterization ultrasonic puncture positioning device comprises a positioning body, wherein the positioning body comprises a fixed seat connected to an ultrasonic probe end and a needle seat arranged on the front side of the fixed seat, the lower portion of the fixed seat is pivoted with the lower portion of the needle seat, and the angle can be adjusted around the pivoting center through an automatic angle adjusting mechanism; a needle sleeving portion is vertically arranged on the front side ofthe needle seat, the needle sleeving portion is of a tubular structure made of a transparent material, an initial position marking line is arranged on the lower end surface of the needle sleeving portion, and a length detection mechanism is arranged on the inner wall of the needle sleeving portion; and a micro-control device and a power supply device are arranged on the fixed seat, and the micro-control device is used for