The invention relates to a flexible direct-current power-transmission converter static-state direct-current charging tolerance time protection constant value setting method. The setting method comprises the following steps of firstly, acquiring time information of processes of scheduling instruction issuing, operation, execution, equipment state check and the like, according to maximum time needed by operation, drawing an operation time graph and determining operation time; then, according to a flexible direct-current converter static-state direct-current charging simulation model, acquiring a static-state direct-current charging time upper limit threshold value when a proportion of submodules which start and stop repeatedly reaches 50%; and substituting the operation time and the upper limit threshold value into a setting formula and acquiring a setting result of a static-state direct-current charging tolerance time when requirements of the operation time and the upper limit threshold value are simultaneously satisfied. The invention aims at providing the converter static-state direct-current charging tolerance time protection constant value setting method. A condition that a converter is in a static-state direct-current charging state for a long time so that polarization of a submodule voltage is serious is prevented, and a theory basis is provided for protection constant value setting in a flexible direct-current power-transmission engineering relay starting process.