Lab nonsaturated earth substrate attracting force determinator

The utility model relates to a laboratory unsaturation soil substrate suction determinator, which is provided with a cavity; a water filling port, an air discharging port, a pottery plate substrate and a sub-pressure gauge; the tope end of the water filling port is provided with an examination cap; an air discharging cap is arranged on the air discharging port in a rotation way; a high air-intake value porous pottery plate is fixedly arranged on the pottery plate substrate; a capacity-fixed rigid soil cup is inserted in the pottery plate substrate; the sub-pressure gauge is arranged at one side of the water filling port and is made of rigid material; the capacity-fixed rigid soil cup is provided with test soil sample. The determinator has the advantages that technical requirements on the experiment personnel are low, the unsturation soil substrate suction can be quantitatively measured, and the price is low; and the deterinator is applicable to the industrialized production.