The invention discloses a multifunctional detection robot for an urban drainage pipeline. The multifunctional detection robot for the urban drainage pipeline comprises a fixed frame body and two crawler wheels; the two crawler wheels are symmetrically installed on the two sides of the fixed frame body through rotating shafts correspondingly; the rotating shafts are used for adjusting the inclined angle of the crawler wheels; the fixed frame body is provided with a first lifting frame; the upper portion of the first lifting frame is fixedly provided with a fixed barrel; the upper portion of the fixed barrel is fixedly provided with a supporting frame mechanism; the two crawler wheels and the supporting frame mechanism form a triangular supporting structure which enables the detection robot to be supported on the inner wall of the urban drainage pipeline in a self-adapting mode. On the one hand, the multifunctional detection robot for the urban drainage pipeline has very high obstacle-surmounting and carrying capacity, can adapt to various complex working conditions and also has an exquisite anti-toppling structure, and the problem that the mechanism is toppled is effectively solved; and on the other hand, the multifunctional detection robot for the urban drainage pipeline also can detect and inspect the interior and the exterior of the pipeline effectively, the functions of cavity detection and pipeline wall detection are achieved at the same time, work time is saved, and the working efficiency is improved.