The invention discloses a road construction device capable of reducing noise and preventing dust. The road construction device comprises a feeding pipe, a stirring box and a second motor. First limiting rotary wheels are fixed to the lower end of the stirring box through connecting pillars. The lower ends of the first limiting rotary wheels are arranged on a first limiting protruding edge in a clamped manner. The lower end of the first limiting protruding edge is fixed to a noise reduction plate. The noise reduction plate is fixed into an outer shell of the device. Buffer connecting heads arearranged between the stirring box and the noise reduction plate. The second motor is fixed into a fixing housing. A rotating shaft is rotataby connected to the lower end of the second motor. Stirringpaddles are arranged on the rotating shaft, wherein the stirring paddles are distributed in an arrayed manner. A connecting pipe is arranged at the lower end of the right side of the feeding pipe. A connecting hose is connected to the lower end of the connecting pipe. An auger is arranged inside the feeding pipe. The left side of the auger is connected to an output shaft of a first motor. By meansof the road construction device capable of reducing the noise and preventing the dust, the problem that cement is directly poured therein to generate the flying dust is avoided; dust prevention can be conducted effectively; and the noise reduction effect is good.