Diameter-variable pipeline cleaning machine vehicle

The utility model relates to the technical field of pipeline cleaning machines, and discloses a variable-diameter pipeline cleaning machine car which comprises a dust suction pipe and a cleaning plate, a self-adaptive variable-diameter mechanism is arranged on the dust suction pipe, and the self-adaptive variable-diameter mechanism comprises a flange quick connector, a junction box, a pushing wheel, a motor, a first connecting rod, a second connecting rod, a hydraulic rod and a third connecting rod. A second connecting rod is pushed to rotate through repulsive force between output shafts of the hydraulic rods and the base, and the second connecting rod rotates in the direction, away from the circle center of the dust suction pipe, of the first connecting rod to drive a pushing wheel and a driven wheel to be away from the circumferential face of the dust suction pipe, so that the driven wheel and the pushing wheel can be always attached to the inner wall of the circular pipeline. A motor on a second connecting