Portable automatic penetration instrument

The utility model relates to a portable automatic penetration instrument for measuring soil engineering properties in real time on site. The portable automatic penetration instrument comprises a penetration touch rod, a touch rod, an automatic acquisition device connected with a pressure sensor, a limiting clamp and a control box fixed on two transverse beams. The portable automatic penetration instrument is characterized by also comprising a transmission rod which penetrates through the control box longitudinally, wherein the transmission rod is in a rectangular shape, and one side of the transmission rod is provided with a screw thread with a dividing rule; the lower end of the transmission rod is connected with the touch rod or penetrates through the touch rod; a main shaft of a speed reducer arranged in the control box is coaxially fixed with a transmission wheel; the transmission wheel is engaged with the transmission rod by the screw thread; and the pressure sensor is embedded in the lower end of the transmission rod and is arranged in the control box. The whole instrument has a weight less than 10kg and has good portability. In addition, the portable automatic penetration instrument has better stability and higher test accuracy and can be well applied to the measurement of soil properties of outdoor shallow soil layer and indoor model tests, etc.