Sugarcane harvesting machine and collecting and unloading device thereof

The invention discloses a sugarcane harvesting machine and a collecting and unloading device thereof. The sugarcane harvesting machine comprises the collecting and unloading device, the collecting andunloading device is installed on a chassis rack of the sugarcane harvesting machine and located below an impurity removal fan, and comprises a connecting base, an underframe, lifting arms, a sugarcane collecting bucket, a translation oil cylinder and a lifting unloading oil cylinder. The connecting base is connected with the chassis rack, the underframe is installed on the connecting base and moves back and forth relative to the connecting base, lifting arm guide rail beams are arranged on the underframe, and provided with straight notches used for limiting, the lifting arms are installed onthe lifting arm guide rail beams, and move along the lifting arm guide rail beams, and the portions, corresponding to the two ends of each straight slot, of the corresponding lifting arm are the highest and lowest extreme posi