Screening and adding system for coarse aggregate for filling

The utility model provides a coarse aggregate screening and adding system for filling. The coarse aggregate screening and adding system comprises a feeding mechanism; the screening mechanism comprises a feeding end and a discharging end, the feeding end is located below the feeding mechanism, the screening mechanism further comprises a first screen, the first screen is obliquely arranged in the direction from the feeding end to the discharging end, and a receiving hopper is arranged at the position, close to the discharging end, of the bottom of the first screen; and the belt conveying mechanism comprises a bearing end and a discharging end, and the bearing end is located below the receiving hopper. The screening mechanism can have a specific screening standard for the particle size of the coarse aggregate added into the filling slurry, and only the coarse aggregate capable of penetrating through the screen holes of the first screen can fall down from the receiving funnel and then is conveyed by the belt conv