A network mode internal auditing system comprises an internal auditing team construction network module, an internal auditing information platform network module, an internal auditing service management network module and an internal auditing result application network module. The company leader group organizes auditing decisions, auditing decision information flows are intercommunicated to the internal auditing service management network module, and auditing committee in the internal auditing service management network module publishes auditing tasks according to the auditing decisions. Auditteam members match personnel from an audit team member reserve library of the internal audit team construction network module to establish an audit team. After the auditing task is received, the auditing group performs data export, analysis, arrangement and online auditing by using an internal auditing information platform network module, inputs problem entry information, forms an auditing reportand a rectification report after offline confirmation, and finally feeds back the auditing report, the rectification report, the auditing report and rectification report information flow to a companyleader group and subordinate units. According to the network mode internal auditing system, auditing work standardization, auditing means informatization and auditing resource intensification are achieved, and the quality and efficiency of internal auditing work are improved.