A modular bottle rack includes at least two modular units laterally mounted to each other. Each modular unit includes a main frame and a basket mounted onto the main frame, wherein the bracket is selectively reciprocally moved relative to the main frame due to a height of the bottle supported on the main frame. Two fasteners are screwed onto the bracket for selectively positioning the bracket on the main frame. The main frame includes is divided into an assembling portion and a supporting portion, wherein a first connecting structure and a second connecting structure are respectively disposed on two opposite sides of the assembling portion, and the first connecting structure is assembled to a second connecting structure of an adjacent modular unit.