The invention provides a multifunctional routing inspection unmanned aerial vehicle which comprises a main body, an inspection camera mechanism is arranged on the main body, rotary arms are fixedly connected to the four corners of the main body, three motors are fixedly connected to the rotary arms, the three motors are arranged on the rotary arms in a straight line, and rotor wings are fixedly connected to output shafts of the motors. The bottoms of the rotor wings are fixedly connected with a fixing frame, and the fixing frame is fixedly connected with a fixing sliding rod. Through cooperative use of the motors, rotating gears, a first toothed plate and a second toothed plate, the distance between placement rods can be adjusted, then the placement space can be adjusted, objects of different sizes can be placed, the routing inspection purpose can be achieved in time through the arrangement of the routing inspection camera mechanism, and through the arrangement of twelve motors and rotor wings, the loading capacity of the unmanned aerial vehicle can be improved, the transportation efficiency of the unmanned aerial vehicle is improved, and the unmanned aerial vehicle is simple and reasonable in structural design, convenient and fast to use and high in practicability.