The utility model provides a multifunctional line inspection knife which is used for solving problems of mass tool classes and difficult carry with electric transmission line inspection tools. The multifunctional line inspection knife comprises a base, a connection rod, a knife head, and a hammer. The base and the connection rod are assembled together, the connection rod and the knife head are hinged together through a bolt assembly, a clamping hoop is sleeved onto the upper portion of the connection rod, a knife head supporting seat is arranged on the clamping hoop, the knife head supporting seat is matched with the bottom structure of the knife head, the hammer has a detachable structure, and a threaded connection structure which is matched with the base is arranged inside the hammer. According to the utility model, characteristics of easy carry, flexible utilization and reliable performance are realized, and not only the working strength of line inspectors is greatly reduced, but also a guarantee can be provided for the safe operation of electric transmission lines.