The invention discloses an outlet valve device of a strip-steel pinch roll and a control method thereof. The outlet valve device of the strip-steel pinch roll comprises an outlet valve, an outlet valve roll, a lower outlet guide plate, a valve following device, a valve limiting device and a valve driving device, wherein the lower outlet guide plate is arranged at the lower part of the outlet valve, and the valve driving device is used for driving the outlet valve to swing around a roll shaft of the outlet valve roll. When the outlet valve device is used, the valve following device or the valve limiting device is regulated according to the specification of strip steel. The outlet valve device of the strip-steel pinch roll is used for regulating and fixing limiting or following positions, solves the problems of exact demands of a gap between the outlet valve and an upper pinch roll when thin strip steel with smaller impact is worn and direct impact of an on-load roll gap of the pinch roll when thick strip steel with larger impact is worn, provides an equipment technical support for different control policies of production technology and more flexibly adapts to production technology requirements; and the control method is simple and flexible and ensures that the production is carried out smoothly.