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This application discloses a method for controlling pulsed emissions of reactant gas during fuel cell startup, relating to the field of fuel cells. The method includes: setting single-pulse emission parameters based on the capacity of the hydrogen removal reactor; establishing a dilution calculation model to predict changes in impurity concentration in the stack's gas chambers; determining, through iterative model calculations, the number of pulse emissions required to bring the impurity concentrations in the hydrogen and oxygen chambers below a threshold, and accordingly determining the total number of pulse emissions; and controlling the tailpipe valve to execute pulse emissions based on the total number of pulse emissions and the single-pulse parameters. This invention achieves on-demand emission through precise model calculations, significantly improving reactant gas utilization and reducing costs while ensuring safety and startup performance.