The invention discloses a paint slag pyrolysis process and a device thereof. The paint slag pyrolysis process comprises a pyrolysis and gasification step and a purification step. After being subjected to raw material preheating, drying, pyrolysis, cooling and discharging in a pyrolysis furnace, paint slag can be effectively pyrolyzed; and after purification is performed, harmless and recycling treatment of the paint slag is realized.