The invention discloses an ultrasonic cable trench sweeping device. The ultrasonic cable trench sweeping device comprises a sweeping mechanism, a garbage storage mechanism and a handle. An ultrasonicgenerator and a garbage hopper are adopted in the sweeping mechanism, the top of the ultrasonic generator is fixedly connected with the side wall of the garbage storage mechanism through a rotating mechanism, the garbage hopper is arranged below the ultrasonic generator, a first garbage storage pipeline is hinged outside the side wall of the garbage hopper, and the end of the first garbage storagepipeline is fixedly connected with the bottom of the garbage storage mechanism through a second garbage storage pipeline. The garbage storage mechanism comprises a shell and a garbage box arranged inthe shell, the end of the second garbage storage pipeline stretches into the garbage box, a negative pressure draught fan for sucking dust is arranged in the garbage box, and the handle is fixedly connected with the shell. Cables can be swept without human intervention, the sweeping range of the device can cover all the portions of cable trenches and the cables, and therefore the problems that manual sweeping is slow, dead corners are generated, and swept dust is difficult to convey are effectively solved.