The United Nations are urging the Barnett government not to introduce a tough new anti-protest law cracking down on "radical protesters" because it could breach international human rights laws.

The WA government introduced a bill into parliament in March, which will be debated in the Upper House on Tuesday, that could see protesters jailed for up to 12 months or face a $12,000 fine if they used devices like thumb locks or arm locks to attach themselves to objects.

UN human rights experts urge the Barnett government not to introduce anti-protest laws.

In some cases protesters could face 24 months behind bars and be slugged with a $24,000 fine if they became aggressive and endangered the safety of others, including themselves.

According to UN law experts David Kaye, Maina Kiai and Michel Forst, the introduction of this law would go against "Australia's international obligations under international human rights law, which includes the rights to freedom of opinion and expression as well as peaceful assembly and association".