The present invention discloses a device used in laboratories to measure horizontal displacement of soil around a region to be treated by vacuum preloading, comprising a box; dredger fill is injected into the box; a vertical drainage board and a vacuum pumping tube are buried within soil in the region to be treated, with the vacuum pumping tube being provided with a vacuum degree detector, the vacuum pumping tube being connected to the plastic drainage board and to a vacuum pump, and a seal membrane covering or wrapping soil in the region to be treated; a loading device is provided above the seal membrane to assist the drainage; transverse tubes are inserted into a side of the box, the transverse tubes being in surrounding soil of the region to be treated; an annular sensing source which is movable along the transverse tubes together with soil is sleeved on the transverse tubes; each of the transverse tubes is provided with a sensing instrument, and the sensing instrument is connected with a sensor which can be inserted into the transverse tube; when the sensor reaches the sensing source, an alarm signal is sent, and in this way, the different positions of the sensing source at different moments of time are determined. The present invention further provides a measurement method by using the device as described above. By the device used in laboratories to measure horizontal displacement of soil around a region to be treated by vacuum preloading, the amount of displacement of soil around the foundation when treated by vacuum preloading can be accurately obtained.

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