The invention discloses a weighing valve of a railway vehicle. The weighing valve comprises a valve body and a valve element assembly and a weighing spring which are arranged in the valve body, the lower end of the valve body is blocked with a lower cover, and an ejecting rod is connected between the lower cover and the valve element assembly and used for transmitting the acting force generated between the lower cover and the valve element assembly, wherein the lower cover and the valve body form a compression cavity in an enclosing mode, the weighing spring is located in the compression cavity, and a disc spring is adopted as the weighing spring. According to the weighing valve, the relation between deformation and stress of the weighing spring can be determined, and then the weighing valve achieves accurate weighing; in addition, the weighing range of the weighing valve is wide, and the weighing valve does not need to be replaced for different vehicle types; meanwhile, due to the fact that the disc spring has the advantage of being high in impact resistance, the weighing valve can adapt to the severe working condition and is not prone to be damaged, and it is guaranteed that the service life of the weighing valve is long. The invention further discloses the railway vehicle including the weighing valve.