Pit digging machine

The invention relates to a pit digging machine which comprises a machine frame, a rotary shaft motor, two rotary shafts, chain wheels, a chain and a conveying belt. A transmission groove is formed in the machine frame, the two rotary shafts include a driving rotary shaft and a driven rotary shaft and are respectively arranged at two ends of the transmission groove formed in the machine frame, and the chain wheels are fixed to the two rotary shafts and are connected through a chain. The conveying belt is fixed to the chain. Multiple loading frames are evenly arranged on the conveying belt at intervals, and multiple draining grooves are evenly formed in the loading frames. The rotary shaft motor controls the driving rotary shaft to rotate, the chain wheel fixed to the driving rotary shaft drives the chain and accordingly enables the conveying belt to operate, and green plums are taken out of a pit through the loading frames arranged on the conveying belt and delivered to a next processing process. Due to the fact that loading frames are provided with the draining grooves, redundant water and impurities can be discharged out, and raw material preparation is made for the next process.