Magnetic building block

A magnetic building block, comprising:

• a building block main body comprising:
• a first surrounding wall group formed by connecting a plurality of surrounding walls end to end in sequence,
• an inner wall group comprising a plurality of supporting walls integrally formed with an inner side of the surrounding walls, and the surrounding walls and the supporting walls cooperatively form a plurality of compartment parts;
• a plurality of elongated stop parts, wherein each of the compartment parts receives one of the stop parts;
• a plurality of magnets received in the compartment parts, and each provided with an N pole and an S pole;
• an upper side wall connected to an upper end of the first surrounding wall group;
• and
• a lower side wall connected to a lower end of the first surrounding wall group;
• wherein the upper side wall is spaced apart from the upper end of each of the stop parts to form one upper receiving space between the upper end of each of the stop parts and the upper side wall, and the lower side wall is spaced apart from the lower end of each of the stop parts to form one lower receiving space between the lower end of each of the stop parts and the lower side wall, thereby the stop parts separates the upper receiving space and the lower receiving space, and each of the magnets is received in the upper receiving space or in the lower receiving space, the stop parts allows the magnets positioning adjacent to the upper side wall or the lower side wall and a free rotation in the compartment parts;
• wherein the building block main body further comprises a partition plate part connected to the inner side of the surrounding walls, the compartment parts comprise four upper compartment parts located on an upper surface of the partition plate part, and four lower compartment parts located on a lower surface of the partition plate part, the stop parts comprise four upper stop parts received in the respective upper compartment parts, and four lower stop parts received in the respective lower compartment parts, and a length of the upper stop part is greater than a length of the lower stop part.