The invention belongs to the field of simulation of marine environment, in particular to a control device for providing a simulated marine environment for a corrosion fatigue test. The defects of time and labor waste, inaccurate control and the like in the prior art are overcome, and the control device is used for corrosion fatigue tests of a simulated tidal range area, a flowing seawater area, asea splashing area and other environments. The device is provided with a control system and an environment simulation system, wherein a core of the control system adopts a programmable logic controller; and the environment simulation system is provided with an environmental cabinet, and an artificial seawater circulation loop, a compressed air channel and a hot air channel which are respectively connected with the environmental cabinet. The control system can perform programmable control on artificial seawater cycle interval contacted with tested samples and alternate wetting and drying time to the precision of a second; and the environment simulation system can simulate environmental modes of the seawater flowing area, the tidal range area and a spindrift splashing area. By matching witha fatigue test program, the device can realize the corrosion fatigue tests of materials under combination of any environmental spectrum and loading spectrum in the seawater flowing area, the tidal range area and a spindrift splashing area.