Suspension type dual-stage stretchable individual hydraulic prop

The utility model belongs to hydraulic props, and particularly relates to a suspension type dual-stage stretchable individual hydraulic prop. A first-grade oil cylinder is installed in a second-grade oil cylinder, a base is connected with a groove in the lower end of the second-grade oil cylinder to tightly press an end cover into the second-grade oil cylinder, a movable prop body is arranged in the first-grade oil cylinder and connected with a top cover through elastic cylindrical pins which are distributed in a radial mode, a small plug is connected to the top of the movable prop body, one end of a reset spring is hung on a hanging ring of the small plug, the other end of the reset spring is hung on a hanging ring of the end cover, a liquid infusion opening is formed in the lateral side of the second-grade oil cylinder, a three-way valve is connected to the liquid infusion opening, and the other two outlets of the three-way valve are connected with a pressure detector and a liquid infusion valve respectivel