Utility knife

The utility model relates to a utility knife comprising a handle and a blade disposed at the front end of the handle. The handle is a plastic handle. The blade can be folded and rotated in the handle. A metal sheath is disposed outside the blade; the back of the metal sheath is in a curvilinear shape. The outer edge of the rear end of the handle is an arc wire-retaining cutting edge which is rotatable. The inner side of the rear end of the handle is provided with a tooth socket matching with the arc wire-retaining cutting edge. Teeth of the arc wire-retaining cutting edge arranged at the outer side of the rear end of the handle are as many as those of the tooth socket arranged at the inner side of the rear end of the handle and are equal to those in diameter. The utility knife is simple in structure, has functions of a common utility knife, allows a wire and a wire coating to be conveniently cut, has the additional function of pulling the wire coating, ensures that electric shock rarely occurs, and is safer to use.