Soil sampling device for constructional engineering

The invention discloses a soil sampling device for constructional engineering, and the device comprises a protection box, a positioning box, a sampling pipe, a lubricating mechanism, a dismounting mechanism and a damping mechanism; a motor is fixedly mounted in an inner cavity of the protection box, a driving shaft is arranged at one end of the motor, the driving shaft penetrates through the surface of the bottom end of the protection box, and the lubricating mechanism comprises a sleeve. According to the invention, through the arrangement of the sleeve, the long-time rotation friction force increase of the driving shaft on the motor at the bottom end of the protection box is effectively avoided, so a certain lubricating effect is achieved, the rotating efficiency of the driving shaft is improved, and the working efficiency of the device is further improved; through the arrangement of the pull handle, the problem that when the sampling pipe is damaged after long-time use and needs to be replaced, the dismount