The invention discloses a method for automatically pre-processing setting parameters for relay protection fixed value setting. The method includes the following steps: 1. reading a power grid operation method which is required in fixed value setting calculation; 2. reading a primary equipment of the power grid which requires fixed value setting calculation; 3. reading setting rules which are adopted in relay protection fixed value setting calculation; 4. based on the read setting rules, determining the setting parameter type which is required in the calculation of respective setting rule; 5. consolidating primary devices and setting parameter types of the power grid, eliminating repeated devices and setting parameter types; 6. transmitting the integrated primary device information and the setting fixed value type information to a computing module for calculating setting parameters; and 7. reading the related setting parameters of the primary devices of the power grid that are provided by the computing module, in combination with the read setting rules, completing relay protection fixed value setting. According to the invention, the method herein avoids inefficient and repeated calculation, greatly reduces computation, and increases calculation speed.