Additive feeding and adding device

The utility model discloses an additive feeding and adding device, and relates to the technical field of feed additives, the additive feeding and adding device comprises a separation cylinder, a crushing mechanism is arranged in the separation cylinder, the crushing mechanism comprises a grinding cylinder, a rotating pipe and a fixing rod, and the outer surface of the rotating pipe is fixedly connected with a fixing plate; three rotating rods are fixedly connected to the outer surface of the fixing plate, and grinding rollers are rotationally connected to the outer surfaces of the three rotating rods. Through the arrangement of the crushing mechanism, the crushed additive falls into the separation cylinder through the filtering holes of the grinding cylinder, the additive which is not crushed cannot be filtered out from the filtering holes of the grinding cylinder, and the grinding roller continues to grind and crush until the crushed additive is filtered out from the grinding cylinder, so that the crushing o