The invention discloses a convenient road guardrail cleaning device. The device comprises a base with wheels, a lifting device is arranged on the base, a connecting block is arranged on the top of the lifting device, an illuminating lamp is arranged on the top of the connecting block, the illuminating lamp is fixedly connected with the connecting block, a fixing sleeve is arranged on the right side of the connecting block, a supporting rod is arranged in the fixing sleeve in an inserting mode, more than one connecting sleeve is arranged on the supporting rod in a sliding mode, a fixing piece is arranged on the top of each connecting sleeve, and a brush head rod is arranged in each fixing piece in an inserting mode. The transverse spacing distance between every two connecting sleeves is adjusted through an adjustable assembly, so that brush heads are applicable to road guardrails with different specifications, and convenience is brought to cleaning work conducted on the road guardrails; the heights of the brush heads are adjusted through the lifting device, so that vertical motion is convenient to conduct for road guardrail cleaning; the device is convenient to move through the wheels, so that convenience is brought to road guardrail cleaning in different places and on different occasions, and use is very convenient. According to the device, the structure is simple, the cost is low, and the device is suitable for application and popularization.