Combined pile for building

The utility model relates to a building composite pile which comprises a pile body, the two ends of the pile body in the axial direction of the pile body are defined as a first connecting part and a second connecting part correspondingly, a first flange is arranged on the first connecting part, a connecting block is arranged on the surface, back to the pile body, of the first flange, a second flange is arranged on the second connecting part, and the connecting block is connected with the second flange. Connecting holes allowing connecting blocks to be inserted therein are formed in the surfaces, back to the pile bodies, of the second flanges, the connecting blocks are inserted into the connecting holes of the pile bodies adjacent to the connecting blocks, and connecting assemblies used for fixedly connecting every two adjacent pile bodies are further arranged between the two adjacent pile bodies. According to the combined pile, every two adjacent pile bodies can be fixedly connected, when a user needs to use