Heavy metal wastewater treatment and recovery system

The utility model relates to the technical field of waste liquid treatment, in particular to a heavy metal wastewater treatment and recovery system which comprises an adjusting unit, a settling tank, a water treatment unit and a sludge treatment unit, the adjusting unit comprises a comprehensive adjusting tank and a wastewater stirring tank which are communicated with each other, and one side of the wastewater stirring tank is communicated with a buffer tank; the buffer pool is communicated with the settling tank; the water treatment unit comprises a clear liquid tank, a clear water pump, reverse osmosis equipment and a water return tank which are communicated in sequence; the sludge treatment unit comprises a thick slurry stirring tank and a filter press which are communicated in sequence; the bottom of the settling tank is communicated with the thick slurry stirring tank, and an overflow tank is arranged at the top of the settling tank and is communicated with the clear liquid pool. The pH value and the met