Method for recovering metal palladium and preparing superfine palladium powder by using formate and application of method

The invention discloses a method for recycling metal palladium by using formate and preparing superfine palladium powder and application of the method. The method comprises the following steps: (1) preparing the palladium-containing waste liquid with the pH value of more than 1.5, adding formate into the palladium-containing waste liquid, reducing at normal temperature and normal pressure, dissolving the obtained solid with aqua regia, removing impurities with ammonia water, and adding acid to prepare palladium precipitate; (2) dissolving the palladium precipitate, and reducing by using formate at normal temperature and normal pressure to obtain superfine palladium powder with the specific surface area of more than 10m < 2 >/g; in the step (1) and the step (2), formate is independently selected from one or a mixture of formate of 2-hydroxy-N, N, N-trimethyl-1-propylamine, cesium hydrogen phthalate and ammonium dithiocarbamate respectively. The method can be used for recovering palladium from palladium-contain