The invention discloses a scheduling plan security correction method and system. According to the method, when scheduling plans of certain types are received, fault screening can be correspondingly carried out on plan modes in the scheduling plans according to preset candidate fault screening cross section queues, then the plan modes are grouped, plan modes having priority to carrying out security and stability assessment in each group are determined according to distribution conditions of plan modes capable of being screened and selected in each group, the plan modes are assessed, fault screening and assessment are carried out on the other plan modes in each group on the basis of assessment results of the assessed plan modes, and assessment after fault screening is carried out on the plan modes in each plan mode group as far as possible. The candidate fault screening cross section queues are synchronously updated by means of data of the assessment results of the security correction to serve as fault screening bases for later scheduling plan security correction, and therefore time consumption of multi-class scheduling plan security correction rolling execution is reduced through the method and system.