Soil sampling device

The utility model discloses a soil sampling device which comprises a steel pipe with the top end connected with a driving device of a pile machine, a tubular soil sampler is fixed to the lower sectionof the steel pipe, a vertical oil cylinder is arranged in the tubular soil sampler, and the vertical oil cylinder is connected with an oil pump and an oil tank which are arranged on the pile machinethrough an electromagnetic valve and an oil pipe arranged in the steel pipe. The free end of a piston rod of a vertical oil cylinder extending downwards is hinged to the upper end of a valve, a pair of guide rails extending obliquely downwards towards the opposite pipe walls are arranged on the inner walls of the pipes on the two sides of the valve, the valve is in sliding fit with the guide railsto close or open the valve, and the front end of the valve is in an arc shape matched with the arc shape of the inner walls of the pipes. A steel pipe body below a vertical oil cylinder of the tubular soil sampler consists of