Demoulding device for concrete impermeability test

The utility model relates to the field of concrete impermeability tests, in particular to a demoulding device for a concrete impermeability test. According to the technical scheme, the demolding device for the concrete impermeability test comprises a lower supporting body and an upper jacking lantern ring; wherein the lower support body comprises a support plate, a support column, a support outer ring, a positioning channel and a handle channel; the supporting column and the supporting outer ring are arranged on the supporting plate; the supporting outer ring is composed of two arc-shaped faces which are symmetrically arranged, the supporting column is a solid column with the diameter smaller than that of the supporting outer ring, an annular positioning channel is formed in a gap between the supporting column and the supporting outer ring, and a symmetrical handle channel is formed in a gap between the two arc-shaped faces. The upper top lantern ring comprises a sleeve, a sleeve plate, a protruding edge and