The utility model relates to a frozen-earth sample preparation machine which belongs to the field of frozen-earth experimental sample preparation special machines and tools in geotechnical engineering geological survey. The frozen-earth sample preparation machine essentially solves the problems of poor reliability of experimental data, high labor intensity of workers and low working efficiency. The frozen-earth sample preparation machine comprises a support (2) and a motor (7); the upper end of the support (2) is provided with a gear, a rack and a pressure device (1) consisting of a control handle; the motor (7) is subsequently connected with a transmission bar (6) and a sampler (5); and the sampler (5) comprises single acting inner and outer pipes, a circular sampler cutting edge (23) connected with the lower ends of the inner and outer pipes, a cone cutting drill bit (24), a sleeve (20) and a liner tube (21) in the hole. The frozen-earth sample preparation machine can shorten the frozen earth sample preparation time, maintain good frozen earth original state, improve the testing data reliability, reduce labor intensity and improve working efficiency.