A strapping machine having a movable working assembly includes comprises a machine body, a chute, and a movable working assembly. This machine body contains a storing space. The chute has an upper chute portion and a lower chute portion. The movable working assembly which is in the storing space includes a horizontal movable portion, a vertical movable portion, a working device, and an operation linkage mechanism. When the vertical movable portion moves to the move-down position, the lower chute portion is separated from the upper chute portion. Then, the movable working assembly can be moved out for easy maintenance. So, it is quick and easy to repair any internal device or part inside the strapping machine. The repairer does not need to stoop or squat down for repairing it. In addition, it saves strength and time to move out the working device or related part.