The utility model discloses a mortar stratification degree tester. The mortar stratification degree tester comprises an upper stratification degree cylinder, wherein the upper stratification degree cylinder and a lower stratification degree cylinder are connected by a bolt; a base is welded on the bottom of the lower stratification degree cylinder; the lower part of the upper stratification degree cylinder is provided with a rubber gasket and an iron ring; the rubber gasket is pasted on the bottom of the upper stratification degree cylinder; the iron ring is welded on the periphery of the lower part of the upper stratification degree cylinder, and is close to the rubber gasket and coats the rubber gasket. According to the utility model, the rubber gasket is fixedly pasted on the bottom of the upper stratification degree cylinder, so that the rubber gasket is integrated with the upper stratification degree cylinder and the lower stratification degree cylinder, and the iron ring is welded on the lower part, on which the rubber gasket is pasted, of the upper stratification degree cylinder; the rubber gasket is effectively prevented from being pulled and deformed in the long-term use process, and the phenomenon that the rubber gasket cannot be used in winter is prevented; in the use process, only the upper stratification degree cylinder is needed to be dismounted, and the operation is convenient and rapid.