The invention discloses a shrink ratio equivalent test model for the explosion effect in a warship cabin. The shrink ratio equivalent test model comprises a cabin body, a pressure measurement mounting seat, a pressure measurement assembly, a vibration measurement mounting seat, an accelerometer, a support pillar, a powder charge hole and a locating block; the shrink ratio equivalent test model is mainly characterized in that the cabin body is an enclosed compartment provided with a cornice; the dimensions of all wall plates are determined according to the shrinkage scale of 1 to 4 with the prototype, and the thicknesses of the wall plates are determined according to the shrinkage scale of 1 to 4 and by the similarity criterion formed by material and the thickness of the wall plates; the restraint of an adjacent cabin for a compartment structure is simulated by the support pillar and the cornice of the compartment. The shrink ratio equivalent test model has the remarkable advantages the test model is the shrink ratio equivalent model for the warship cabin, so that the dimension is small, the manufacturing cost is low, and the destroy effect of the test model is basically equivalent to that of the actual ship; therefore, the shrink ratio equivalent test model is suitable for warship target damage effect test and evaluation research.