The invention relates to a vehicle-mounted automatic soil sampling device. The device comprises a GPS positioner, a supporting frame, a vehicle-mounted connecting device, a
power controller, a supportejector rod, a support, a
hydraulic pump, a power source, a lifting driving device, a soil stripper and a soil sampling
drill. A bottom groove extends out of a car hopper, the soil sampling
drill islifted by the lifting driving device, the lifting driver drives the soil sampling
drill to collect a soil sample in a target area, and when the soil sampling drill reaches the soil sampling depth, thesoil sampling drill is lifted to a
fixed position, the soil stripper strips soil, thus completing the soil sampling operation. According to the method, the
land parcel in the soil sampling area can be put on line, the position coordinates of the soil sampling point can be planned in advance according to the shape of the
land parcel, a soil sample of the planning point can be collected according to the
GPS positioning function, and the coordinate points can be recorded on line.