Method for preparing platinum nitrate solution

The invention belongs to the field of noble metal compounds, and particularly relates to a method for preparing a platinum nitrate solution. In order to solve the technical problems, the method for preparing the platinum nitrate solution comprises the following steps: A, performing acid treatment: soaking platinum with hydrochloric acid to remove impurities, taking out the platinum to wash after soaking is ended; B, performing acid dissolving: putting the washed platinum into an acid solution, and heating a system to sufficiently react, wherein the acid solution is a mixed solution of concentrated hydrochloric acid and concentrated nitric acid; C, removing nitric acid: adding concentrated hydrochloric acid to sufficiently remove nitric acid; E, generating platinum dioxide hydrate: adding glacial acetic acid to regulate the pH value of the system to be 3-6, standing, filtering and washing; and F, dissolving nitric acid: adding nitric acid into washed precipitates, heating to sufficiently react, and filtering to obtain the platinum nitrate solution. The platinum nitrate solution prepared by the method is low in impurity content, and meets the use requirements.