Slipping film and linear cutting type soft soil geotome and operating method thereof

A slipping film and linear cutting type soft soil geotome and an operating method thereof are provided. A sampling tube is fixed below a rear seat; a tube shoe is fixed to the lower end of the sampling tube; a piston for pushing out a soil sample is arranged in the sampling tube. The slipping film and linear cutting type soft soil geotome is characterized in that the upper end of the tube shoe is provided with a tube shoe cavity, a thin film, a clamp ring and a cutting ring are pre-arranged in the tube shoe cavity, the rear seat is provided with a rear seat cavity, a vent valve and a wire winding-unwinding device are arranged in the rear seat cavity, the wall of the sampling tube is symmetrically provided with four vent holes, the rear seat cavity is communicated with the tube shoe cavity through the vent holes, a steel wire is arranged in one vent hole, the upper end of the steel wire is fixed to the wire winding-unwinding device, an inner slit is formed in the inner wall at the connection of the sampling tu