Bottom door opening device of railway wagon

The invention discloses a bottom door opening device of a railway wagon. The bottom door opening device comprises an upper crank throw and a lower crank throw, the ends, close to each other, of the upper crank throw and the lower crank throw are in key connection to a transmission shaft, an included angle is formed between the upper crank throw and the lower crank throw, and a power structure, a first connecting rod and a second connecting rod are arranged at the end, away from the transmission shaft, of the upper crank throw; a round pin is arranged at the ends, close to each other, of the first connecting rod and the second connecting rod in a penetrating mode, the ends, away from each other, of the first connecting rod and the second connecting rod are hinged to the two bottom doors correspondingly, and the two ends of a transmission rod are rotationally connected with the round pin and the end, away from the transmission shaft, of the lower crank throw correspondingly. According to the bottom door opening