Soil screening mechanism of buried cable laying device

The invention discloses a soil screening mechanism of a buried cable laying device, which comprises four supporting rods which are fixed on a supporting plate and are arranged in a rectangular shape, one end of a screen bucket connecting rod is connected with the upper ends of the supporting rods through pin shafts, and one end of the screen bucket connecting rod is connected with a screen bucket through a pin shaft; a first screw driven by a first stepping motor is arranged between the left supporting rod and the right supporting rod, one end of a connecting rod is connected with a first nut matched with the first screw through a pin shaft, and the other end of the connecting rod is connected with a screen bucket connecting rod through a pin shaft. The screen hopper is obliquely arranged, and a notch is formed in the oblique low point; a collecting barrel fixedly connected with the supporting rod is arranged below the screen hopper, a secondary screen is arranged at the bottom of the collecting barrel, and a