The invention belongs to the technical field of residential area garage design, and relates to a modular split-level garage building design method suitable for a residential area. According to the multi-layer modular staggered-layer arrangement, the bicycle building area is reduced, the construction cost of an underground garage is greatly reduced, and the parking number is greatly increased compared with that of a traditional garage; meanwhile, due to the multi-layer arrangement, more parked vehicles can be parked around the building, and the requirement for nearby parking is met; and more available ground space and flexibility are brought to sponge city design, ground greening, equipment room arrangement and the like; the driving route is direct, the identifiability is high, and compared with a large-area traditional garage lacking identification, the garage is clearer; and the method is suitable for different terrains and complex building layouts, for example, the method has more advantages for sloping fields and special-shaped lands.