The invention discloses a calcium content determination method for low-calcium aluminum ferromanganese. The calcium content determination method comprises the following steps: utilizing hydrochloric acid-hydrogen peroxide to dissolve a sample; utilizing ammonia water to separate out aluminum, iron and other elements; using ammonium persulfate to oxidize and remove manganese to form colloidal precipitate; after filtering and separating out the precipitate, repeating the manganese removing process; adding hydrochloric acid to a manganese-removing solution; boiling the solution to remove superfluous ammonium persulfate; using ammonia water to regulate the pH value to be 7; splitting a part of solution; adding a masking agent to eliminate other ion interference; carrying out complexometric titration to determine the calcium element content. With application of the determination method disclosed by the invention, the calcium content in low-calcium aluminum ferromanganese can be accurately, stably, simply and efficiently determined, and the determination for the calcium content in the low-calcium aluminum ferromanganese can be faster and more convenient, so that the determination cost can be reduced.