Annular water inlet thin wall soil sampler and use method thereof

The invention discloses an annular water inlet thin wall soil sampler and a use method thereof. The annular water inlet thin wall soil sampler comprises a drill rod joint pipe, an annular water inlet pipe cap, a waste soil room pipe, a thin wall sampling pipe and a safety bolt, wherein one end of the annular water inlet pipe cap is connected with the bottom end of the drill rod joint pipe; the other end of the annular water inlet pipe cap is connected with one end of the waste soil room pipe; the other end of the waste soil room pipe is connected with the thin wall sampling pipe; a circle of water inlet through holes are formed in the annular water inlet pipe cap along the circumference of the annular water inlet pipe cap. During use of the annular water inlet thin wall soil sampler, water is fed through the annular water inlet pipe cap in a static pressure process for flushing a pipe wall, thereby preventing waste soil from entering the waste soil room pipe and the thin-wall sampling pipe in the static press