A system for the removal of Cu2+ and crystal violet from aqueous solution by foam separation was used. The goal of this work was to explore a method for simultaneous desalination and decolorization by foam separation. In the aqueous solution of this work, Cu2+ was used for studying desalination and crystal violet was used for studying decolorization, respectively, and dodecyl benzene sulfonic acid (DBSA) (C18H29SO3H) was used as a surfactant. The effect of surfactant concentration, pH, superficial velocity, and foam height on the removal percentage and the enrichment ratio were studied to optimize the conditions. Under the optimum conditions, the removal percentage of Cu2+ and crystal violet were 96.5% and 96.3%, respectively, and the enrichment ratio of Cu2+ and crystal violet were 3.7 and 3.6, respectively.