The invention discloses a machine for machining ebony with different diameters. A vertical supporting column is connected to the other end of a supporting rod, a containing box is connected to the lower end of the supporting column, a vertical pipe is connected to the containing box, the side face of the pipe is provided with an opening, a containing trough which can slide along the inner wall ofthe pipe is arranged at the opening of the pipe, the length of the containing trough is larger than that of the opening, and a first inflatable pipe and a second inflatable pipe which are perpendicular to each other and stretchable are arranged on the containing trough; the upper end of the pipe is provided with a cylinder, the first inflatable pipe and the second inflatable pipe are both connected with the cylinder, the first inflatable pipe and the second inflatable pipe are each provided with a stretchable connecting rod, the lengths of the connecting rods are adjusted through the first inflatable pipe and the second inflatable pipe, and the two ends of each connecting rod are each provided with a fixing block used for fixing an ebony bead; and a sucking pump is arranged in the pipe andused for sucking air at the opening. The machine for machining the ebony with different diameters is simple in structure and convenient to operate and use.