Internal auditor is a special post set in the implementation of ISO9000 quality management system. In the ISO9000 quality management system standard, organizations are required to conduct regular internal audits to evaluate the performance of the quality management system. Before applying for ISO9000 quality management system certification and annual audit, the organization must complete at least 1 comprehensive internal audit.

The internal auditor will be responsible for this work. According to the requirements of ISO9000 quality management system standard, internal audit must be conducted by trained personnel, that is, by internal auditors. The audit shall be conducted according to the procedures of internal audit documents formed by the quality management organization, and shall be responsible for the results recorded and reported. Auditor of internal quality management system.

Usually by people who are proficient in ISO9000 international standards and familiar with enterprises. According to ISO9000 audit, the internal quality system audit is conducted by trained and qualified internal auditors. Therefore, any organization that implements ISO9000 usually needs to train a group of internal auditors. The internal auditor can be a part-time employee of each department.

In addition to requiring certified enterprises to have internal auditors, because internal auditors are familiar with various international standards, internal auditors should monitor almost all the work processes and links of enterprises. Therefore, at the same time, it is also a test and improvement of one's own ability. Because of the particularity of internal auditors' work, they often have to contact with middle and senior leaders of enterprises, so they have more opportunities for promotion and development and can realize their dreams.