A compound saw, including a frame; a motor driving assembly, which is sleeved in the frame and rotatable around a first axis perpendicular to a main plane of the frame relative to the frame; and a saw blade, which is mounted on an output shaft of the motor driving assembly and rotatable around a second axis passing through the output shaft relative to the motor driving assembly. The second axis is parallel to the first axis, and there is an eccentric distance between the second axis and the first axis.