The utility model relates to a pipeline desilting robot based on a wall supporting connecting rod mechanism. The pipeline desilting robot comprises a desilting cylinder, a telescopic cylinder, a frontmounting disc assembly, a rear mounting disc assembly, a wall supporting rod assembly and a walking assembly. Each of the front mounting disc assembly and the rear mounting disc assembly comprises aconnecting rod hinged support and a driving cylinder hinged support, and the front mounting disc assembly further comprises a front mounting disc; the rear mounting disc assembly further comprises a rear mounting disc; the desilting cylinder is arranged at the bottom between the front mounting disc and the rear mounting disc; wall supporting rod assemblies are arranged at the same positions of thefront mounting disc and the rear mounting disc; the wall supporting rod assembly further comprises a lower wall supporting cylinder arranged on a plate body on the outer side of the wobble wheel. Therobot has the advantages of being reasonable in structural design, convenient to operate and use, low in maintenance cost, high in automation and intelligence degree and the like, the function of adjusting the maximum size of the exterior of the robot is achieved through contraction and expansion of the wall supporting connecting rod mechanism, the size requirement for entering and exiting an inspection well is met, and the supporting requirement during dredging operation is met.