The invention provides a process for drying lauryl sodium sulfate, which belongs to the technical field of preparation of a surfactant in an organic compound. The method is carried out in a compound vacuum drier formed by a vacuum tube type spray drying part (A), an adapting tank (B) and a vacuum scraper drying part (C), and comprises the following steps: (1) preheating a lauryl sodium sulfate material in a preheater to the temperature of between 50 and 100 DEG C, and making the material be in a half atomized state and enter a vacuum drying tube with vapor in the vacuum tube type spray dryingpart (A) at a pressure of between 0.2 and 1.0MPa by a conveying pump, so that the moisture content of the material is reduced to 50 to 10 percent; (2) introducing the material into the vacuum scraperdrying part (C) through the adapting tank (B) for secondary drying, so that the moisture content of the dried material is lower than 3 percent; and (3) according to the prior process, granulating thedried materials through a double screw extruder to manufacture an acicular product. The process has reasonable design, and can effectively improve the drying efficiency and product quality.