The invention discloses an experimental apparatus and method for change rule of mining water level of an unconsolidated confined aquifer. The apparatus comprises a data collector and a simulation box, wherein a simulative coal rock bed is arranged in the simulation box, an unconsolidated confined aquifer bag is arranged in the simulative coal rock bed at the upper part of the simulation box, the upper part of one side of the unconsolidated confined aquifer bag is provided with a water level pipe extended out the simulation box, and the other side of the unconsolidated confined aquifer bag is provided with a water inlet pipe extended out the simulation box and connected with a water tank; and the water level pipe is provided with a water level gauge connected with the data collector. Changes of the water level of the aquifer along with the mining of a working face is recorded by the water level gauge, so that an corresponding temporal-spatial relation between the changes of the water level and the movement of a key layer can be simulated, influence factors of the temporal-spatial relation can be simulated, and the temporal-spatial relation between the changes of the water level anda water-conducting crack zone under the confined aquifer also can be simulated. The apparatus is simple in structure, convenient to operate, diversified in use and adjustable in height of a water level supply source, and can implement different confined water heads and meet the simulation requirements under different mining conditions.