An interlocking paving brick assembly comprises a protruding brick (10) and a recessing brick (20). The protruding brick is a block and comprises a first top portion (11) and four first sidewalls (12). Every angle between each of the first sidewall and the first top portions is a right angle, each of the first sidewall comprises a tenon structure (13). The recessing brick is a block, including a second top portion (21) and four second sidewalls (22). Every angle between each of the second sidewall and the second top portions is a right angle, and each of the second sidewall comprises a mortise structure (23). The tenon structure of the protruding brick and the mortise structure of the recessing brick is structurally complementary to each other, so the protruding brick and the recessing brick can be connected by the tenon structure and the mortise structure to form the interlocking paving brick assembly.