Protective cover for railway tank car

The utility model particularly relates to a protective cover for a railway tank car. The protective cover is used for solving the problems that a spring opening assisting device of an existing railway tank car protective cover device has many accessories and is tedious in structure. The device comprises a large adding and discharging cover and a protective cover, the large adding and discharging cover is fixedly installed at a manhole in the top of a tank body, and the protective cover is installed on the periphery of the upper surface of the large adding and discharging cover, so that valve seats on the large adding and discharging cover are all located in the protective cover; the protection cover comprises a cover cylinder, a cover cap, a spring opening assisting device and a supporting lug assembly. The lower end face of the cover cylinder is fixed to the upper surface of the large adding and discharging cover, and the cover cap is hinged to one side of the upper end face of the cover cylinder through a s