The present invention relates to a method of recovering waste mercury comprising the steps of: 1. Pour the degreasing cleaning liquid into a container containing waste mercury, and the volume ratio of the oil cleaning liquid to the waste mercury is 2:3, stir, and pour out the cleaning liquid; 2, filtering; 3, formulated by the addition of a saturated cleaning solution of potassium permanganate and 20% concentrated nitric acid cleaning agent, the cleaning agent to the ratio of the volume of mercury waste 1 by volume ratio of a saturated solution of KMnO 4 and concentrated nitric acid is 8:2 After stirring for 20 minutes, a volume of 1:1 HNO3 solution was added. The volume of the HNO3 solution was 1/2 of the volume of waste mercury, stirred for 1-2 minutes, allowed to stand, and the waste liquid was poured out to obtain mercury. The mercury recovered by the method of the present invention has high purity and can be reused. Moreover, the residue waste liquid that has been sieved and filtered meets the national emission standards. Windows And Doors Fitting,Aluminium Fittings For Doors And Windows,Aluminium Window And Door Fitting,Installing Windows And Doors Sinogar Metal Co.,Ltd , https://www.sedinoalu.com