The invention discloses a brush suitable for brushing a narrow-neck glass bottle. Symmetrical square protruding strips are arranged on the external diameter ends of a cylindrical long rod, the middle of the cylindrical long rod is provided with a circular hole, a compression spring and clamping beads, and a circular baffle plate is arranged at the bottom end; four lower square grooves which are evenly distributed are formed in the upper end of the circular baffle plate, a circular rubber plate is arranged at the lower end, and bristles which are evenly distributed are arranged at the lower end of the circular rubber plate; a circular pipe is arranged on the upper portion of the cylindrical long rod in a sleeving mode; lower hemispherical concave holes are formed in the inner diameter wall thickness parts of the upper portion and the middle portion of the circular pipe respectively; a circular check ring is arranged at the bottom end of the circular pipe; square guide grooves are formed in the inner diameter wall thickness parts of the circular pipe and the circular check ring respectively; four upper square grooves are formed in the lower end of the circular check ring; the two ends of an elastic steel sheet are arranged in the upper square grooves and the lower square grooves in an inserted mode respectively; the elastic steel sheet is arranged and fixed in an elastic rubber rod in an inserted mode; bristles which are evenly distributed are arranged at the external diameter end of the elastic rubber rod. According to the brush suitable for brushing the narrow-neck glass bottle, all-around brushing can be conducted, and the brushing quality and efficiency of the brush suitable for brushing a narrow-neck glass bottle can be obviously improved.