The invention relates to a method for analyzing subsynchronous oscillation of a near-region dense thermal power multi-direct current transmission system. The method comprises the following steps of 1, obtaining static parameters of the near-region dense thermal power multi-direct current transmission system; 2, utilizing the static parameters to screen units with subsynchronous oscillation risk as to-be-researched units; 3, building a complex frequency domain equation of a network part and a complex frequency domain model of an electromagnetic part of a power generator of each to-be-researched unit; 4, according to the complex frequency domain equation and the complex frequency domain model, calculating complex torque parameters of each to-be-researched unit; 5, according to the complex torque parameters of each to-be-researched unit, calculating the frequency of subsynchronous oscillation risks of each to-be-researched unit. The method has the advantages that the complex topology analysis does not need to be performed for generating a network proper tree to determine the state variables of a network, the strict rule and positive direct regulation do not need to be followed for numbering branches and nodes, the state space of the network part can be conveniently generated, and the calculation complexity is low.