On-site footprint protection device

The invention provides an on-site footprint protection device, and belongs to the technical field of case on-site investigation tools. The on-site footprint protection device comprises a protection shell and a cover body, the protection shell comprises a side wall and an upper end face, an opening part is formed in the center of the upper end face, and an annular water seal groove is formed in theperipheral side of the opening part; the cover body comprises a side wall and an end face, and when the cover body is buckled on the opening part, the side wall of the cover body is located in the water seal groove. According to the scheme, the on-site footprint protection device is buckled on an on-site footprint, so that footprint smell does not flow along with air, volatilization and degradation are not likely to happen, and when the footprint protection device is used, the cover body can be taken up to be smelled by police dogs, and the footprint cannot be damaged; due to tight sealing, for soil footprints, the h