Reverely latching-proof core taking up tool

The utility model relates to a reversely latching-proof core taking up tool used for drilling stratum cores, which prevents from generating reversely latching between upper and lower joints and the inner cylinder of the core taking up tool. The screwed connection part between the inner cylinder 3 and the upper joint 1 is assembled with an outer sleeve 2 by a collar, the outer sleeve 2 is screwed with the inner cylinder 3, the buckle shape is reverse to the buckle shape which adopts screwed connection between the inner cylinder and the upper joint (3, 1). The screwed connection part between the inner cylinder 3 and the lower joint 6 is inlaid with an anti-loosing spring cushion 5 which together with the outer sleeve 2 plays the action to prevent from generating reversely latching between the upper and the lower joints and the inner cylinder.