Heating device for crude oil conveying pipeline

The crude oil conveying pipeline heating device comprises an electromagnetic heater and a controller, the electromagnetic heater comprises a main through pipe, a left by-pass pipe, a right by-pass pipe and an electromagnetic coil, and the left by-pass pipe and the right by-pass pipe are arranged on the two sides of the main through pipe correspondingly; the upper end of the main through pipe is respectively connected with the upper end of the left bypass pipe, the upper end of the right bypass pipe and the medium outlet pipe through the upper four-way joint, the lower end of the main through pipe is respectively connected with the lower end of the left bypass pipe, the lower end of the right bypass pipe and the medium input bent pipe through the lower four-way joint, and the electromagnetic coil is wound on the main through pipe and/or the left bypass pipe and the right bypass pipe; the output end of the controller is connected with the electromagnetic coil. The temperature sensor is connected with the input