Railway vehicle chassis, under-vehicle equipment arrangement structure and railway vehicle

The invention discloses a railway vehicle chassis, an under-vehicle equipment arrangement structure and a railway vehicle, which solves the problem of diversification of railway vehicle chassis design in the prior art, have the beneficial effects of facilitating the design of the railway vehicle and reducing the manufacturing cost. According to the invention, the under-vehicle equipment arrangement structure is characterized in that each chassis comprises a chassis body; a sewage tank mounting space is reserved in at least one end of the chassis body, and a water tank mounting space is reserved in the chassis body; the two ends of the chassis body are a first end and a second end, a middle section is arranged between the first end and the second end, the middle section is lower than the first end and the second end, the middle section comprises two parallel first longitudinal beams, the two first longitudinal beams are connected through a plurality of first cross beams, and every two adjacent first cross beam