Deep soil stratified sampling device for soil survey sampling

The invention discloses a deep soil stratified sampling device for soil survey sampling. The device comprises a rotating drum, an internal cylinder, a supporting mechanism and a scraping device, wherein the rotating drum comprises an upper rotating drum and a lower rotating drum which are in threaded connection; two soil sampling holes are formed in the lower rotating drum; the internal cylinder comprises a rotating cylinder and a sampling cylinder, the bottom ends of which are in threaded connection; and an external cylinder is arranged outside the internal cylinder. The device has the following advantages that: a scraping device is arranged, the structure is simple, the operation is easy, an existing sampling bottle is replaced to sample in the mode of directly contacting with the soil and the sampling efficiency is high; and the soil sampling holes are formed, the problem that the sampling device is difficult to close when the deep soil sampling is finished is overcome, the openingand closing of the sampli