The invention relates to vehicle oil pressure shock absorbers, in particular to a stepless adjustable damping valve for a high-precision internally-arranged oil pressure shock absorber. The stepless adjustable damping valve for the high-precision internally-arranged oil pressure shock absorber is characterized by comprising a piston rod, a movable valve system, a middle sleeve, a work valve system and a piston valve system which are vertically and sequentially connected; the movable valve system is inlaid in the upper portion of the middle sleeve, the middle sleeve is in threaded connection with a metal connecting sleeve at the end of the piston rod, the work valve system is packaged in the middle sleeve in a riveted manner through an end mechanism, and the piston valve system and the middle sleeve are in threaded connection; the stepless adjustable damping valve for the high-precision internally-arranged oil pressure shock absorber is simple in structure and small in needed mounting space, motion resistance of a movable valve element is small, and the adjusting precision is high; and damping force of the shock absorber can be subject to damping adjustment according to the road condition and the will of a driver, damping force can also be automatically adjusted completely according to input signals of a system, and the riding comfort is greatly improved.