The invention discloses a modular low-layer assembling type house system of a special-shaped column steel structure, and belongs to the technical field of structural engineering. The modular low-layer assembling type house system of the special-shaped column steel structure comprises assembling type house modules, assembling type roof modules, assembling type staircase modules and flange plate connectors among the modules. The assembling type house modules, the assembling type roof modules and the assembling type staircase modules are processed and manufactured in a factory. On the construction site, the modules are connected through the flange plate connectors via high-strength bolts in a bolting mode, and then pipelines among the modules are mutually connected, so that construction is finished. The modules are easy to detach and convey, and can be reused. The modular low-layer assembling type house system of the special-shaped column steel structure integrates modularization, industrialization, standardization and assembling performance, realizes industrialized production, can be rapidly assembled on site and can be reused. On the premise of guaranteeing construction quality, the construction speed is improved, the construction period is shortened, and engineering construction cost is reduced.