The invention discloses a water collecting ditch forming device for a road gutter inlet, and belongs to mold type road building assisting equipment. The device is used for manufacturing water collecting ditches for the left and right sides of the gutter inlet respectively, and mainly solves the problem that accumulated water near a water collecting opening cannot automatically flow into the watercollecting opening. As for accumulated water slightly far away from the water collecting opening, the conveying distance for sweeping the accumulated water can be greatly shortened by means of the function of increasing the length of the water collecting ditches. The water collecting ditch forming device for the road gutter inlet is applied before the last procedure of construction of an asphalt pavement or a concrete pavement, and is used through a human-assisted electric vibration machine. The forming device is simple in structure and mainly comprises a circular tube for ditch pressing and forming, a T-shaped frame of an equipment body, a vibrator for ditch pressing and force applying, and a T-shaped handrail for ditch pressing.