The utility model discloses an 18 F- fluorodeoxyglucose (FDG) synthesis modular structure which comprises a box body and a wind-heat outlet. A groove opening is arranged in the end portion of the wind-heat outlet. Box body wooden partitions are arranged on three sides of the wind-heat outlet. Due to improvement, the18F-FDG synthesis modular structure has the functions that the synthesis reaction process can be observed and manual adjustment can be conducted when necessary, and therefore smooth conduction of reaction and reaction yield rate can be ensured.