A bidirectional sand dispensing device, comprising discharge ports, wherein each of the discharge ports comprises a lower plate and an upper plate, the upper plate is provided above the lower plate, and an endpoint of a free end of the upper plate is located above the lower plate, an included angle between a horizontal plane and a plane where the endpoint of the free end of the upper plate and an endpoint of a free end of the lower plate are located is a leakage angle, particulate materials form an inclined plane under barrier effect of the upper plate and the lower plate, the inclined plane is located on a same plane as the plane where the endpoint of the free end of the upper plate and the endpoint of the free end of the lower plate are located, an included angle between the inclined plane and the horizontal plane is the leakage angle, which is adjustable by changing relative positions between the upper plate and the lower plate, wherein two discharge ports are provided, wherein two adjacent discharge ports are arranged in a mirror symmetrical manner; and the two adjacent discharge ports are configured to operate alternately; and one end of lower plate of one of the discharge ports is combined with one end of lower plate of the other one of the discharge ports to form a splayed shape, and a spring is provided between the one end of one lower plate and the one end of the other lower plate, and the spring is configured such that the degree of the leakage angle is unchanged when the bidirectional sand dispensing device is in a motion working condition, wherein the bidirectional sand dispensing device further comprises a sand discharging tank and two sets of vibration device provided on two sides of the sand discharging tank and fixedly connected to side beams, respectively, wherein the discharge port is provided at a lower opening of the sand discharging tank, one end of the lower plate is connected to the sand discharging tank, and an opposite end of the lower plate extends downward by a distance and then is bent toward inside of the sand discharging tank to form a bent section of the lower plate; and the upper plate is a flat plate, and one end of the upper plate is connected to the sand discharging tank, wherein the bidirectional sand dispensing device further comprises a mounting plate and pins; and the mounting plate is fixedly connected to the sand discharging tank, and one end of the lower plate is hinged to the mounting plate, angle scales are provided on the mounting plate, and a plurality of holes for pin positioning are provided in the mounting plate, and both sides of one end of the lower plate are fastened to the mounting plate by the pins. wherein the bidirectional sand dispensing device further comprises a sand discharging tank and two sets of vibration device provided on two sides of the sand discharging tank and fixedly connected to side beams, respectively, wherein the discharge port is provided at a lower opening of the sand discharging tank, one end of the lower plate is connected to the sand discharging tank, and an opposite end of the lower plate extends downward by a distance and then is bent toward inside of the sand discharging tank to form a bent section of the lower plate; and the upper plate is a flat plate, and one end of the upper plate is connected to the sand discharging tank, wherein the bidirectional sand dispensing device further comprises a mounting plate and pins; and the mounting plate is fixedly connected to the sand discharging tank, and one end of the lower plate is hinged to the mounting plate, angle scales are provided on the mounting plate, and a plurality of holes for pin positioning are provided in the mounting plate, and both sides of one end of the lower plate are fastened to the mounting plate by the pins.