The invention relates to a multistage high-pressure buffering angular quickly opened stop valve with an annular spring. The stop valve comprises a valve stem, a valve seat and a valve spool, wherein the valve stem is connected with a pneumatic actuator through a piston shaft; the valve seat and the valve spool are arranged in a valve body at the head of the valve stem; the valve spool is of a hollow structure, a guiding self-aligning shaft is arranged in a cavity of the valve spool and is provided with the annular spring which absorbs impact load of the valve spool and the valve seat, a concave spherical surface is arranged at an end, which is connected with the head of the valve stem, of the guiding self-aligning shaft, and the concave spherical surface of the guiding self-aligning shaft and a convex spherical surface of the head of the valve stem are assembled correspondingly; and the tail end of the valve stem and the piston shaft are connected integrally through a disc coupler A and a disc coupler B, and a buffering gasket which strengthens buffering and bending stress between the piston shaft and the valve stem is arranged between the disc coupler A and the disc coupler B. A sealing structure is reasonable, breakage fault of the valve stem is eliminated, and the valve spool and the valve seat can be matched correctly. Besides, sealing parts can be replaced without halt, and production cost is reduced.