The utility model discloses a simple chain-balanced overhead door for a garage. The overhead door comprises a liftable door body, a door lifting way guide mechanism, a lifting power mechanism, a left-right lifting balancing mechanism, a lifting-up in-place detection mechanism, and door stand columns for supporting and positioning the overhead door body. The door lifting way guide mechanism consists of two door stand columns and a lifting guide channel, the two door stand columns are respectively fixedly arranged on the left side and the right side, and the lifting guide channel is arranged on the liftable door body; the lifting power mechanism consists of a speed reduction motor arranged on the upper end of one door stand column, and a set of chain-drive mechanism; the left-right lifting balancing mechanism consists of a chain wheel shafts of a chain wheel B and a chain wheel C which are arranged below the liftable door body close to the left side and the right side, and a section of fixed-length balancing chain; the simple chain-balanced overhead door for the garage is simple in structure, and safe to use.