Factory-like house-in-house manufacturing construction method based on BIM

The invention discloses a factory-like house-in-house manufacturing construction method based on BIM, and belongs to the technical field of house building construction. The method comprises the following steps of 1, surveying and setting out, and drawing an overall design drawing of a house-in-house; 2, based on the BIM technology, carrying out house-in-house three-dimensional modeling according to the design drawing. 3, according to the house-in-house three-dimensional modeling, finding out errors and omissions of design drawings in time, and further optimizing the house-in-house three-dimensional modeling. 4, according to the house-in-house three-dimensional modeling, importing design drawing data into special numerical control machining equipment, and completing one-time machining forming of all components in the house-in-house. 5, conveying the machined components to a construction site. 6, leveling the ground. and 7, assembling the components according to the design drawing numbers to form the whole hous