Abstract: This disclosure provides a building block sheet and a building block toy. The building block sheet comprises a shell, an electrical connection assembly and a functional assembly. Since the electrical connection assembly includes a positive and a negative electrode conductive frames, positive electrodes and negative electrodes, the functional assembly is in contact with the positive and negative electrode conductive frames respectively, and the positive and negative electrodes are exposed through corresponding notches on the shell, the building block sheets can be electrically connected to each other through contact between the positive and negative electrodes thereof after being assembled. Electrical components inside are powered by the positive and negative electrode conductive frames, which can reduce or eliminate the use of conductive wires and electrical contacts, so that the internal electrical connection structure is simple and reliable.