Model YTLX hydraulic adjustable stabilizer is a new kind of adjustable stabilizer for well drilling. The adjustable stabilizer pushes out its piston by the drilling pressure to adjust its diameter. When drilling or lifting the drilling tools, its piston will retract automatically to prevent blockage or jamming phenomenon. Because of simple structure, good abrasion resistance, and wider adjustable diameter range, the stabilizer can be used to expand the hole, especially suitable for directional drilling and horizontal drilling.