The invention relates to a slowly-open slowly-close fully-open and vibration-free swing check valve, and belongs to the technical field of valves. The swing check valve comprises a valve body, a valve deck arranged on the valve body, a valve shaft arranged at the upper end, close to a water inlet, inside the valve body, and a valve clack fixedly connected to the valve shaft. The valve shaft penetrates through the valve body and stretches out of the valve body, a locking arm is fixed to the inner side of the valve clack, and the part, stretching out of the valve body, of the valve shaft is connected with a first driving device; the valve body is provided with a rotating shaft, the part, located in the valve body, of the rotating shaft is fixedly connected with a locking hook used for hooking the locking arm, and the part, stretching out of the valve body, of the rotating shaft is connected with a second driving device. The swing check valve plays a role in sealing and checking, and also has a locking function. The swing check valve has valve closing and opening functions, when a system operates normally, a valve closure member, namely the valve clack, can be fully opened, water damage of the system is reduced, energy resources are saved, and shaking of the valve clack is small after the valve is opened.