The utility model discloses a rabbling mechanism of heavy metal trapping agents such as high performance mercury, lead, casing including hollow structure, the inner weld of casing has the drainage plate, the weeping hole has been seted up on the drainage plate, the inside of the top of wall of drainage plate is installed around the direction along it and is blown the liquid coil pipe, one side ofcasing is installed and is blown the feed liquor pipeline that the liquid coil pipe communicates, the liquid inlet channel who is located on the casing is seted up to the top of drainage plate, the circular channel has been seted up to the bottom of drainage plate, circular channel bottom opening part screw has cup jointed the collecting vessel, the drainage tube rather than the inside intercommunication is installed to the bottom of casing, the rectangle operation passageway that runs through the casing is seted up to one side below of drainage plate. The utility model has the advantages of being simple in structure and convenient in operation, make on the one hand heavy metal trapping agents such as high performance mercury, lead and sewage carry out the intensive mixing, heavy metal ineffectual the purifying waste water, on the other hand collects the precipitate that the heavy metal formed, avoids filter screen blocking, conveniently retrieves the heavy metal.