The invention relates to a method for determining content of red phosphorus in an electronic product by a gravimetric method. The method comprises the following steps: crushing and evenly mixing a sample to be determined, and then adding concentrated alkali liquor to the sample to react with the sample to generate hydrogen phosphide. The gravimetric method is used for determining as follows: the hydrogen phosphide is absorbed by 50mL of 5% aqueous silver nitrate solution; when the reaction is completed, the obtained mixture is pre-baked to a constant-weight No.4 glass colander at 105 DEG C plus or minus 2 DEG C for filtration, and then the mixture is weighed, thus the red phosphorus content can be calculated. The method for detecting the content of the red phosphorus in the electronic product is rapid and effective, and the relative average deviation is less than 10%; therefore, the method for detecting the content of the red phosphorus in the electronic product is reliable and convenient, and can meet the research and production needs.