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This application discloses a soft-start control circuit, method, device, and auxiliary lamp for a lamp module. The soft-start control circuit relates to the field of auxiliary lamp control technology. The soft-start control circuit includes: a switching transistor drive circuit; a switching transistor circuit including at least one switching transistor, with its input connected to the drive circuit and its output connected to the control terminal of the lamp module; and a main control module, whose output is connected to the drive circuit. The main control module receives the lamp module's on / off signal and outputs a control signal, causing the drive circuit to periodically control the switching transistor in the drive circuit to turn on and off according to the control signal until the duration of the main control module's output control signal reaches a target time. This application improves the reliability of lamp module control.