The present invention provides a wall block. The wall block (1) comprises a first wall (11), a second wall (12), a third wall (13) and a rib (14), wherein the first wall (11) is in parallel with the second wall (12), the third wall (13) is securely connected between the two walls, at the two respective ends of the two walls; the rib (14) is connected fixedly between the first wall (11) and the second wall (12), and forms a hollow portion (17) with the third wall (13). With the technical solution, as the wall block has a hollow structure, a load-bearing structure (such as a bearing pillar) may be arranged directly in the hollow structure of the wall block, unlike the traditional wall blocks which need to be piled up around the load-bearing structure (such as a bearing pillar) at a large amount. Therefore, the wall block of the present invention can save time for piling up the same and improve construction efficiency.