Soil sample preparation all-in-one machine

The invention relates to the technical field of soil sample preparation, in particular to a soil sample preparation all-in-one machine which comprises an instrument frame, a sample injection system and a screening and collecting system; the sampling system is mounted on the outer side of a vertical track of the instrument frame, and the sieving and collecting system is mounted on the inner side of the vertical track of the instrument frame; the sample introduction system is located above the sieving and collecting system, a discharge port of the sample introduction system is located in the sieving and collecting system, and a crushing system for crushing, size grading and sieving samples in the sieving and collecting system is further arranged on the inner side of the vertical track of the instrument frame. The machine has the functions that crushing, size grading, sieving and waste discharging of soil samples are carried out simultaneously and circularly in a limited sealing area, crushing and sieving are ca