Thin-wall soil sampler and thin-wall sampling method suitable for sandy oil

The invention discloses a thin-wall soil sampler suitable for sandy oil. The thin-wall soil sampler comprises a thin-wall sampling tube and a pipe shoe, wherein an upper end of the pipe shoe is connected with a force application device and a lower end of the pipe shoe is provided with a soil sampling cutting edge, the force application device comprises a force application device cover which tightly covers the upper end of the pipe shoe and is mounted thereon, moreover, the force application device cover is provided with an air vent, and the air vent is provided with a pressurizing vent valve;the pressurizing vent valve comprises a valve body, the lower end of the valve body is provided with a threaded connector in airtight connection with the air vent, moreover, an exhaust chamber and anexhaust channel which is connected with the exhaust chamber and the inside space of the thin-wall sampling tube are arranged in the valve body, the upper end of the exhaust channel is in the form of aconical opening of which a