The invention discloses a condensate water drainage channel structure and a floor for a railway passenger vehicle. A drainage channel is of an arch structure with the middle higher than the two ends in the length direction. Two vertical faces of the drainage channel are each provided with a plurality of drainage holes, the drainage holes in the two vertical faces are symmetrical with respect to the width central line of the drainage channel, and the drainage holes in each vertical face are symmetrical with respect to the length central line of the drainage channel. According to the condensate water drainage channel structure, condensate water located in wave troughs can be conveniently guided into the drainage channel and then drained outside the vehicle. The condensate water in the wave troughs flows into the drainage channel through the long round holes in the vertical faces of the drainage channel firstly, and since the middle of the bottom face of the drainage channel is higher than the two ends of the drainage channel, the condensate water flows to the two sides and flows out through a drainage pipe; and if the drainage pipe is blocked and not dredged in time, the condensate water is stored in the drainage channel since the bottom face of the drainage channel is lower than the wave troughs, and the stainless steel drainage channel is good in corrosion resistance.