Full-buffering hydraulic damper

A full-buffering hydraulic damper comprises an oil shell, the oil shell is in a bottomed cylinder shape, a buffering cavity is formed by an inner hole of the oil shell, a piston assembly is installed in the buffering cavity in a sliding mode, a rodless cavity is formed between the piston assembly and the bottom of the buffering cavity, and a rod cavity is formed between the piston assembly and the opening end of the buffering cavity. The piston assembly is connected with a buffer rod, the buffer rod penetrates through an end cover covering an opening of the buffer cavity and then extends out of the oil shell, the buffer rod is sleeved with a sealing ring and a pre-pressing spring, one end of the pre-pressing spring abuts against the sealing ring, the other end of the pre-pressing spring abuts against the piston assembly, and the pre-pressing spring pushes the piston assembly to move in the inward shrinkage direction. The damper has the advantages that the compensation spring is installed in the compensation c