The invention provides a method for producing permanent white which comprises four steps of pulpifying, transforming, washing and recycling comprehensively: firstly, adding barium carbonate into water to be pulpified; secondly, adding soluble sulphate to be transformed to permanent white; obtaining the qualified sediment permanent white product after being washed by dilute sulphuric acid, stirring the liquid after transformation, adding sulphuric acid so that the mixture is transferred to be soluble sulphate, returning to the pulpifying process to be recycled, taking CO2 generated in the reaction as the raw material for producing barium carbonate; or introducing CO2 gas to the transferred liquid to be crystallized so as to seed out supercarbonate and returning the mother liquid to the pulpifying process to be recycled. The method has simple technique and convenient operation, does not generate waste water or waste slag in the whole technique process, protects the environment, and has high comprehensive utilization rate of resources.