Low-energy-consumption fabricated green building and construction method

The invention discloses a low-energy-consumption fabricated green building and a construction method in the technical field of fabricated buildings. The low-energy-consumption fabricated green building comprises a foundation, wherein stand columns arranged at equal intervals are fixedly connected to the upper portion of the foundation, an outer wall is fixedly connected between the two stand columns, the outer wall is a hollow shell, an inner wall is arranged in the outer wall, the interior of the inner wall is hollow, and racks are fixedly connected to the inner walls of the left side and the right side of the outer wall. When a building worker pulls the inner wall upwards from the interior of the outer wall, a blocking plate is linked to rotate through movement of the inner wall, a sealed ventilation opening is opened, airflow above a built house can circulate through the ventilation opening, the walls with the ventilation opening are oppositely installed, air convection is facilitated, air circulation is f