Portable soil sample collecting device

The utility model relates to the field of soil sampling, and discloses a portable soil sample collecting device which comprises a collecting cylinder, a fixing mechanism is arranged on the outer side wall of the collecting cylinder, and a collecting rod is further arranged in the collecting cylinder; the fixing mechanism comprises a plurality of groups of fixing assemblies which are arranged in an annular array; the fixing assembly comprises a first supporting plate, a second supporting plate and a connecting plate. One end of the first supporting plate is rotationally connected with the collecting cylinder, the other end of the first supporting plate is hinged to the upper end of the second supporting plate, and the connecting plate is detachably connected to the first supporting plate and the second supporting plate. When the device is not used, the connecting plates can be detached, so that the first connecting plate and the second connecting plate are attached to the outer side wall of the collecting cyli