The invention provides an oil pressure damper. The oil pressure damper comprises an oil storage cylinder. The oil storage cylinder is internally sleeved with a working cylinder. The oil storage cylinder and the working cylinder are filled with hydraulic oil. A guide cover is arranged at one end of the oil storage cylinder and the working cylinder in a sealed mode. A bottom valve base is arranged at the other opposite end of the working cylinder in a sealed mode. The oil storage cylinder and the working cylinder are further filled with gas. The bottom valve base is provided with a bottom valve unit which can circulate the hydraulic oil in the oil storage cylinder and the working cylinder. According to the oil pressure damper, the situation that the size of the oil storage cylinder is increased due to the fact that a compensation air bag is installed is not needed, so that the structure of the hydraulic oil damper is more compact; and in addition, the production cost of the compensation air bag and an installation assembly is reduced, the installation time of the compensation air bag and the installation assembly is saved, and the market competitive advantage is improved.