The invention provides a highway construction concrete pouring device and an operation method thereof, and belongs to the technical field of concrete pouring equipment. A discharging outlet is formedin the lower end face of a pouring barrel, and a sealing cover is slidably arranged at the discharging outlet; a barrel cover is mounted at the upper end of the pouring barrel, and a feeding inlet isformed in the barrel cover; a stirring mechanism is mounted in the middle of the barrel cover in the axial direction, and the upper end of the stirring mechanism penetrates out of the barrel cover andis fixedly connected with a three-jaw chuck which is fixed to the stirring mechanism; and a brushing mechanism is mounted at the lower end of the stirring mechanism, and the outer wall of the pouringbarrel and a telescopic traveling frame are fixedly connected. Concrete in the pouring device can be continuously stirred to be prevented from being solidified or segregated, normal using of the concrete is ensured, the construction period is shortened, and the concrete pavement quality is ensured; and meanwhile, the brushing mechanism is internally arranged to automatically brush the inner wallof the pouring barrel, and the situation that the too much concrete adheres to the inner wall and the discharging outlet of the pouring barrel, and consequently discharging of the discharging outlet is influenced can be avoided.