The invention discloses a control system for an intelligent welding device. The control system comprises a fourth one-way valve, a hydraulic oil pump, a current adjusting device, a welding machine and an ammeter. The current adjusting device, the welding machine and the ammeter are connected in series. A central processing unit is connected with the ammeter, and is connected with the current adjusting device. An oil tank is connected with a hydraulic oil input end of the hydraulic oil pump. A second one-way valve and a third one-way valve are connected with a hydraulic oil output end of the hydraulic oil pump. The second one-way valve is connected with a first one-way valve and a first synchronous valve. The first one-way valve is connected with the oil tank. The first synchronous valve is connected with hydraulic cylinders. The hydraulic cylinders are connected with a second synchronous valve. The second synchronous valve is connected with a third one-way valve and a fourth one-way valve. The fourth one-way valve is connected with the oil tank. A control information output end of the central processing unit is connected with all the valves and the hydraulic oil pump. During the welding process, fluctuation of the actual current value can be automatically reduced, the actual current value can be enabled to fluctuate around the set current value, the wielding quality is beneficial for being improved, and automatic control is beneficial for being realized.