Magnetic building block

The magnetic building block comprises a shell and a plurality of magnets, the shell comprises two sub-shells, the two sub-shells are detachably connected, half grooves are formed in the inner walls, close to the opening sides of the sub-shells, of the two sub-shells, and under the state that the two sub-shells are connected, the half grooves are formed in the inner walls of the two sub-shells. The opposite half grooves in the two sub-shells are communicated to form a containing groove, one magnet is contained in each containing groove, and the magnets are arranged in the corresponding containing grooves in a free overturning mode. According to the magnetic building block, the magnets can freely turn over, the magnetic poles can be automatically adjusted according to the other spliced building blocks, when the magnetic building block is connected with the other building blocks, the magnets can turn over to generate vibration and sound, a feedback signal is formed, and therefore the hand feeling is improved, an