The invention relates to a fast analytical method of molybdenum in molybdenum concentrate, which comprises the following steps: weighed sample is added with nitric acid and potassium chlorate, heated and dissolved, and then is added with hydrochloric acid, heated, dissolved and evaporated after cooling down a little; after cooling down to room temperature, purging by adding water and heating are carried out so that the salt is completely dissolved; afterward, sodium hydroxide solution is added, heated and boiled, and then cooled down to room temperature before being immigrated into a volumetric flask, volume determining and filtering, after measuring a certain volume of filtrate and regulating pH value, a buffer solution with pH value of 5-7 is added, heated to slight boiling, and excessive plumbic titer with a fixed amount is added with constant stirring, heated, boiled and cooled down to room temperature; after that, the solution is immigrated into a volumetric flask, volume determined, let stand, filtered, and then lead content of the solution is measured by atomic absorption method. The analytical method has the advantages that the procedure is simple, the operation process is easy to control and easy to master, moreover, the measuring time is reduced to half of the gravimetric method, which is more suitable for analyzing and measuring flow sample, the result obtained has favorable accuracy and precision, and is accurate and reliable.