Primary and secondary fusion complete ring main unit

The invention relates to a primary and secondary fusion complete ring main unit which comprises a tank body, a water collecting device used for collecting rainwater is arranged at the upper end of thetank body, a spraying pipe communicated with the water collecting device is connected to the upper end face of the tank body in the circumferential direction, and a control valve used for controllingon-off of the spraying pipe is installed at the joint of the spraying pipe and the water collecting device. A draining pump is arranged on the spraying pipe, and a plurality of spraying heads are arranged on the spraying pipe in the circumferential direction at intervals. When it rains frequently in summer, the water collecting device can collect and store rainwater, when the outdoor air temperature is high, the control valve is opened, the drainage pump is started at the same time, the rainwater in the water collecting device is led into the spraying pipe, the rainwater in the spraying pipeis sprayed out through the