Injection head motion device of continuous string coiled tubing unit

The invention provides an injection head motion device of a continuous string coiled tubing unit. The injection head motion device comprises main mounting seats, wherein a main shaft and a rotary cylinder supporting shaft are arranged in parallel between the main mounting seats; one end of each of two movable synchronous plates is sleeved on the main shaft; the other end of each of two movable synchronous plates is connected with a rotary cylinder mounting sleeve sleeved on the rotary cylinder supporting shaft; an injection head is arranged between the two movable synchronous plates and fixedly connected with the two movable synchronous plates; a cylinder body of a rotary cylinder is mounted on a cylinder seat of the injection head; a piston rod of the rotary cylinder is fixedly connected with the rotary cylinder mounting sleeve; a cylinder body of a movable cylinder is mounted on the inner sides of the main mounting seats; and a piston rod of the movable cylinder penetrates through one movable synchronous plate and is fixedly connected with the other movable synchronous plate. The injection head rotating function is achieved, so that a coiled tubing outlet of the injection head is vertical to the wellhead plane at any working height; and the injection head moving function is achieved, so that the alignment time of a coiled tubing and a wellhead is saved, the alignment precision is improved, and the sealing performance of a blowout preventer and a shooting nipple assembly is guaranteed.