The Kardashian family is preparing for war — gearing up to unleash a legal attack on everyone who claimed their clothing line is manufactured in child slave labor sweat shops in China.

Sources close to the family say that Mom Kardashian, Kris Jenner is furious — claiming the guy who runs the Institute for Global Labour and Human Rights had no right to accuse the Kardashian brands of wrongdoing because he has no tangible proof to back up his claims.

Kris must have seen I.G.L.H.R. head honcho, Charles Kernaghan on "TMZ Live" Wednesday — when he flat out admitted he didn't actually go to the factories in question and is making the assumption based on years of research on the Chinese manufacturing industry.

Jenner also believes Star Magazine's cover — which screamed "Kardashian Sweatshop Scandal" — was unfair and it should have to pay for any damage that has been caused to the brand's reputation.

As we previously reported, Kris — along with one of their manufacturing companies — adamantly deny the use of child slave labor in their factories … insisting they have people who are constantly patrolling for any possible violations.