The utility model relates to a device for water -level fluctuation of measurationing among laboratory model testing, including upper end open -ended barrel, be equipped with silt in the barrel and pack the chamber, silt is packed the intracavity and is equipped with the drain bar, is gone up the chimney filter of the vertical setting that the lower extreme is sealed, and silt is packed the chamber upper end and is equipped with the sand bedding course that the upper surface was stamped the seal membrane, and the drain bar upper end sets up in the sand bedding course, and chimney filter upper end and sand bedding course lower extreme leave the distance, evenly seted up the inlet opening on the chimney filter wall, chimney filter outer wall parcel filter layer, be equipped with the float that is linked to each other and is constituteed by cursory and magnet in the chimney filter, the outside of the barrel of float correspondence is equipped with the compass, the utility model discloses can be under the rupturable atmospheric condition, record the water -level fluctuation condition in the indoor model under the negative pressure condition, the shortcoming and the unsafe problem of test of loss vacuum energy is revealed to vacuum when having solved the test of conventional pressure -measuring pipe.