The invention discloses a reconstructing method for a small foreign-style house. The reconstructing method includes the steps: a, adding foundations; b, establishing external scaffolds and first floor internal scaffolds; c, adding inner lining concrete walls on inner sides of original external walls; d, removing an original roof and internal original structural walls; e, re-establishing wooden grating floors; and f, re-establishing a roof. The inner lining concrete walls includes first floor internal inner lining concrete walls and second floor internal inner lining concrete walls; the step of adding the inner lining concrete walls further includes adding the first floor internal inner lining concrete walls on the inner sides of the original external walls to a position of an old wooden grating floor, and reconstructing the old wooden grating floor; establishing second floor internal scaffolds; finally adding the second floor inner lining concrete walls on the inner sides of the original external walls to a reconstruction design elevation.