A novel milk bottle brush is disclosed. Provided is a bottle brush adaptable to brush heads of different sizes and capable of washing a bottle at one time. The novel milk bottle brush comprises a handle, a brush handle and a brush head, wherein the head end of the brush handle is connected in the handle through a plurality of winding springs. The end of the brush handle is provided with an inverted U-shaped bayonet. The bayonet comprises two bayonet levers and an adjusting lever. The head end of the two bayonet levers is positioned inside the brush handle and the end is positioned outside thebrush handle. The adjusting rod is movably inserted into the brush handle, and two ends of the adjusting rod are provided with threads with opposite directions. The upper end of the bayonet rod is provided with a plurality of volute teeth adapted to the threads. The invention has the advantages of simple structure, convenient use and is time-saving and labor-saving.