A self-adhesion water stopping strap is good in water stopping performance and convenient to construct. The self-adhesion water stopping strap is formed by compounding a cross-band veneer, a viscose layer and a sand coated layer, wherein the outer surface of the cross-band veneer is covered with the viscose layer in a bonded mode, and the outer surface of the viscose layer is covered with the sand coated layer in a bonded mode. The self-adhesion water stopping strap has certain rigidity and is convenient to construct, the surface of the viscose layer is protected by the sand coated layer, a film does not need to be torn in construction, construction can be performed by workers conveniently, the self-adhesion water stopping strap can be bonded with post-cast concrete, and the ideal effect that water leakage is avoided is achieved. The self-adhesion water stopping strap is good in weather resistance, and the bonding performance between the self-adhesion water stopping strap and concrete can still not be affected under the conditions of sun exposure, water spraying, dust fall and the like.