Device and method for measuring mass moisture content and volume density of soil by utilizing volume replacement measurement way

The invention provides a device and a method for measuring mass moisture content and volume density of soil by utilizing a volume replacement measurement way. The device comprises a controller, a sampling vessel, a weighing device and a saturation system, wherein the controller is connected with the weighing device, and the saturation system comprises a pre-saturation pond and a water supply device. The method comprises the following steps that under the situation that the density of soil particles is known, a soil sample with a certain volume is taken, so initial mass of the soil sample can be measured, then pre-saturation treatment is conducted on the soil sample, water is continuously supplied to the soil sample so as to ensure the soil sample to be maintained at a saturated state, when the mass of the soil sample is constant, the mass of the soil sample at the saturation state is measured, and the mass moisture content of the soil sample can be calculated through a formula according to the volume of the soil sample, the soil particle density, the initial mass of the soil sample, the mass of the saturated soil sample and the water density. The volume replacement measurement way is used for directly measuring the mass moisture content and the volume density of the soil, so that simplicity and convenience in operation can be realized, the measurement precision is high, the instrument stability is good, time and labor can be saved, and the energy can be saved.