The invention relates to a watering device, in particular to a moveable watering device for a highway. For the technical problem to be solved by the invention, the moveable watering device for the highway which is large in watering range and easy to operate, and waters uniformly is provided. In order to solve the technical problem, the invention provides the moveable watering device for the highway. The moveable watering device for the highway comprises a base, a sliding rail, a spring I, a fixed plate, a rotating disc, a speed reducing motor, a connecting rod, a fixed guide rail I, a sliding rod, a watering tank, a hose, an electric wheel, a pulling wire, a sliding block I, a piston, a push rod, a fixed guide rail II, a sliding block II, a spring II, a water storage tank and a water inlet pipe; the sliding rail is arranged at the top of the base; the electric wheel, the sliding block I and the sliding block II are arranged on the front side in sequence from left to right. The moveable watering device for the highway has the effects of large watering range, high watering uniformity and high easiness in operation; plants on the highway can be watered effectively by utilizing the device, so that the plants grow more luxuriantly; the highway environment is beautified.