The invention discloses a combined rotary table welding device and a vacuum chamber adopting the combined rotary table welding device. The vacuum chamber is fixedly installed on a base, the combined rotary table welding device is installed in a cavity of the vacuum chamber and comprises a large rotary table, small rotary tables, a rotating shaft, a first motor, a second motor and a first driving mechanism, one end of the rotating shaft is fixedly connected with the large rotary table, the other end of the rotating shaft is connected with the base, a plurality of small rotary tables are arranged on the large rotary table, the first motor is connected with the first driving mechanism, the rotating shaft is driven to do a rotary motion by the first driving mechanism, the second motor is arranged below the large rotary table in the mode of corresponding to each small rotary table and is used for driving the small rotary table to rotate, fixtures which are used for clamping workpieces are arranged on each small rotary table, and both the first motor and the second motor are controlled to drive by a PLC (Programmable Logic Controller) control unit. The large rotary table and the small rotary tables are combined to rotate, so that a to-be-welded damping table is sent to the combined rotary table welding device of an induction coil, manual operation is replaced by a mechanical device so as to complete the welding process, and the product quality is increased.