The invention discloses a cutting tool. The cutting tool comprises a tool bit and a tool handle, wherein the tool bit is cylindrical, one end of the tool bit is open, the other end of the tool bit is closed, the tool handle is connected with the tool bit and is fixedly arranged at the closed end of the tool bit, a circle of cutting edges are arranged on the end face of the open end of the tool bit, the cutting edges are perpendicular to the end face of the open end of the tool bit, a spring is arranged in a cylinder of the tool bit, and one end of the spring is fixedly arranged on the inner end face of the closed end of the tool bit. The cutting tool is simple in structure and convenient to use, and portions which are cut off can be taken out conveniently.