That law will “restrict the freedom of NGOs in fulfilling their work in the status of human rights defenders,” Ny Chakrya said.
Rights groups say the government has failed to give compensation and prevent the victims of forced evictions from being dragged into poverty.
Extreme poverty in parts of Cambodia has forced many to seek illegal work in other Southeast Asian countries.
Over 170,000 families across the country were hurt by land disputes in 2014, according to a new a report by NGO Forum.
Currently, the government has undertaken a review of its land concession policy, reducing the lease period from 99 year to 50 years for some projects.
International legal experts say a group of laws recently passed in Cambodia to reform the judiciary does little to ensure a balance of powers.
The government has announced a new review of economic land concessions, shortening the period of some from 99 years to 50 years.
Hor Namhong recently instructed incoming Unicef head Debra Comini not to comment on the law, according to a ministry spokesman.
21 NGOs issued their nine principles, which include protections for the human rights on the Internet, freedom of speech and freedom of information.
Experts say migrant laborers lack basic information about threats to them abroad, making them vulnerable to exploitation.
Human rights campaigners claim the World Bank Group has repeatedly failed to intervene to stop its borrowers from cracking down on critics of dams, roads and other projects backed by the bank.
Phang Seiha, who is originally from Prey Veng province, was arrested Saturday in the border town of Poipet, where he was returning to Cambodia from Thailand.