Loading device for measuring porosity of calcareous sand

The utility model provides a loading device for measuring the porosity of calcareous sand, which comprises the following steps of: filling the accommodating space of a loading head with the calcareoussand in a test, covering a cover body, measuring the volume V1 at the moment, pouring out the calcareous sand, filling the accommodating space of the loading head with the previously filled calcareous sand, and covering the cover body to measure the volume V2 at the moment; the connecting buckles at the bottom of the cover body and the bottom of the loading head are buckled to a load loading instrument for a loading test respectively, the volume V3 at the moment is measured after loading is completed, the V1, the V2 and the V3 are all internal volumes and do not contain the volume of a shellof the loading head and the volume of a shell of the cover body, and the porosity is (V2V3)/V1 * 100%; in addition, the connecting buckle is detachably connected with the loading head and the cover body, and different load loa