Deep soil bulk density estimation method

The invention discloses a deep soil bulk density estimation method, and relates to the technical field of soil data estimation. According to the method, the soil burying depth, the shallow soil bulk density, the magnetic susceptibility and the clay content are collected as input data, and a soil compression model is driven by the soil burying depth and the shallow soil bulk density to calculate the bulk density change of deep soil compaction caused by the upper soil compression stress; driving a soil transformation function through the soil magnetic susceptibility and the clay content to calculate volume-weight change, determined by physical characteristics of the deep soil, of the deep soil; adding the two parts of volume weights to obtain a deep soil volume weight estimated value; on the whole, the volume weight conceptual model with a certain mechanism is constructed, the model prediction accuracy is high, the deep soil volume weight can be directly estimated without parameter data calibration, the applica