Urban and rural domestic wastewater heavy metal pretreatment device

The utility model provides a heavy metal pretreatment device for urban and rural domestic wastewater, which belongs to the technical field of wastewater treatment and comprises a treatment box, four grooves are dug in the rear inner wall of the treatment box, and rotating blocks are rotatably connected into the four grooves through rotating shafts. The upper ends of the two rotating blocks on theleft side are fixedly connected with a first proportioning barrel, the upper ends of the two rotating blocks on the right side are fixedly connected with a second proportioning barrel, light-transmitting glass is arranged at the front ends of the first proportioning barrel and the second proportioning barrel, first sliding ways are dug in the left inner wall and the right inner wall of the treatment box, and sliding rods are slidably connected into the two first sliding ways; the ends, close to each other, of the two sliding rods are fixedly connected with a lower frame, a lower filter screenis arranged in the lower f