The invention provides a method for determining selenium content in coarse selenium. The method comprises the following steps of: A) mixing and heating coarse selenium with water, and then adding a reducer to react to obtain a precipitate; B) after dissolving the precipitate with an acid, adding an oxidant to perform an oxidizing reaction, wherein the oxidant is selected from a compound oxidant, potassium permanganate or potassium dichromate formed by perchloric acid and hydrogen peroxide; and C), after salinizing an oxidized product obtained in the step B, adding a precipitant to react to obtain a precipitate, and calculating the selenium content in the coarse selenium according to mass of the precipitate, wherein the precipitant is barium nitrate or barium chloride. The method of determining selenium content in coarse selenium provided by the invention is simple, short in flow, accurate in result and easy to master by an operator. A reagent used in the method is cheap and easily available, and multi-method instruments such as an ICP spectrograph are avoided, so that the test analytical cost is lowered. The method can be suitable for detecting and analyzing coarse selenium production, so that production is favorably guided. The method is also suitable for trade settlement analysis.