The invention discloses a network source coordinated control strategy calculation method and system with stable direct current island frequency. The method includes the following steps: according to an actual power system model, parameters, operation modes and preset faults, performing transient stable time domain simulation to obtain the faults and instability modes leading to instability of a direct current island system; performing speed regulation system auxiliary control parameter design on an island generator set by employing a prime mover speed controller additional control GPSS design;performing parameter design on direct current emergency power support by utilizing a particle swarm optimization algorithm; and forming a network source coordinated control strategy according to theparameter design of speed controlling system auxiliary control quantity, the parameter design of the direct current emergency power support, and the faults and the instability modes leading to the instability of the direct current island system. The method can be used for calculation of offline or online decision-making emergency control measures, improves transient stability of the direct currentisland system, coordinates different control measures of a network source, and improves the coordinated operation level of a machine network and economy and safety of electric power system operation.