Soil grinding and sieving device

The utility model discloses a soil grinding and sieving device, which belongs to the technical field of soil sampling and comprises a fixing plate, the fixing plate is fixed on the middle upper portion of the outer side of a lower shell, connecting plates are fixed on the left side and the right side of the top wall of the fixing plate respectively, and sliding grooves are formed in the side walls, close to each other, of the two connecting plates respectively. Air cylinders are fixed to the middles of the top walls of the connecting plates, and connecting blocks are fixed to the output ends of the air cylinders. Sampled soil is put into the upper shell from the feeding hopper, the driving motor is started, an output shaft of the driving motor rotates to drive the transmission rod and the grinding block to rotate so as to grind the soil, the soil falls into the top of the lower filter screen from the screen in the grinding process, and meanwhile, the vibration motor is started so as to grind the soil. When th