The invention discloses a building block kit, comprising a larger cubic component, a smaller cubic component, a drive motor module, a slope component and connection components, wherein the area of each surface of each larger cubic component is larger than that of each smaller cubic component, a first bump connection structure and a first recess connection structure are formed on surfaces of the larger cubic component, the first bump connection structure is meshed with the first recess connection structure, a second bump connection structure and a second recess connection structure are formed on surfaces of the smaller cubic component, the second bump connection structure is meshed with the second recess connection structure, a first pump connection structure and a first recess connection structure are formed on surfaces of the drive motor module, the second recess connection structure is formed on the surface of the slope component, and the first pump connection structure and the second recess connection structure are formed on surfaces of each connection component.