The invention discloses an ecological soil engineering structure of a combined n-shaped building block. The ecological soil engineering structure comprises a structure body, a retaining wall foundation helping the structure body to achieve stabilization and a soil filtering and water draining system. The shoreline of the soil engineering structure is smooth, the design is ingenious, coordinated stress is achieved, stability is good, construction is fast, the soil engineering structure has the advantages of a water large-size integral planter, an underground semi-open ecological nest, double limiting measures and a good soil filtering and water draining effect, and the ecological soil engineering structure can adapt to revetments of different slopes, and meet the requirements for normal water level greening, underwater biology inhabitation and other comprehensive ecological requirements.