Over 81,864 out of 182,673 foreigners are holding invalid Cambodian documents, report.
Digital identification systems could see developing economies grow up to 13%.
The government yesterday advised Cambodians working and living illegally in South Korea to return home to complete legal documents and apply to work there again.
Officials are targeting perpetrators believed to be behind land encroachment in the Poy Machov protected area.
The Cambodian Embassy in Thailand has instructed illegal migrant workers there to get in contact with its personnel in order to get travel documents allowing them to return to Cambodia.
Four local telecom companies and one non-profit organisation have been warned if they fail to share requested documents.
In the past two months, the Interior Ministry has revoked nearly 10,000 documents used by foreigners living in Cambodia.