The invention discloses a screw conveying device for vacuum coating. The screw conveying device for the vacuum coating comprises a sample table, a conveying module, a power source and a first transmission connecting piece, wherein the sample table is matched with a vacuum coating cavity of vacuum coating equipment; the conveying module is mounted on the sample table and used for conveying a samplefrom a feeding area to a coating area; the power source is fixed to the exterior of the vacuum coating cavity; one end of the first transmission connecting piece is connected with the power source, and the other end of the first transmission connecting piece extends into the vacuum coating cavity and is in detachable transmission connection with the conveying module; the screw conveying device for the vacuum coating is characterized in that the conveying module comprises screw rods, polished rods and second transmission connecting pieces, wherein the screw rods are rotatably mounted on the sample table; screw threads of the screw rods serve as material grooves; each polished rod is mounted on the sample table and positioned on one side of the corresponding screw rod to support a materialtogether; one end of each second transmission connecting piece is in transmission connection with the corresponding screw rod, and the other end of each second transmission connecting piece is in detachable transmission connection with the first transmission connecting piece. According to the screw conveying device for the vacuum coating, a plurality of surfaces can be coated at one time without overturning, so that box opening and re-vacuumizing time is shortened; the efficiency is greatly improved; moreover, the overall structure is simple and the machining cost is low.