Conveying object distribution device, pneumatic sending system, and sample container sending method

The invention discloses a conveying object distribution device, a pneumatic sending system and a sample container sending method. According to the conveying object distribution device, a distribution mechanism is arranged to be connected with a plurality of sending assemblies and cache conveying pieces, the distribution mechanism is provided with a discharging sliding way for receiving the conveying objects at the conveying position of the cache conveying piece and at least two material guiding sliding grooves, the lower end of each material guiding sliding groove is in communication with an inlet of one sending assembly, the distribution mechanism is further provided with a structure for recognizing the length of the conveying objects at the discharging sliding way, and according to the recognized length of the conveying objects, the conveying objects at the discharging sliding way are transferred into the material guiding sliding grooves corresponding to the conveying objects with the lengths through a tran