Slow-closure type check valve

The invention discloses a slow-closure type check valve, which comprises a valve body. A valve seat is arranged on the valve body; a rotary plate is rotatably arranged on the valve seat and is fixedlyconnected with a valve rod; a return rod is arranged on a side face of the rotary plate; an elastic rod is fixedly connected between the return rod and the valve body; a pair of damping fins are further arranged on the valve body and are movably connected with a valve clack; the clamping fins are connected through a linear spring; a reducing pipe is further connected onto the valve body; and a connector is arranged on the tail end of the reducing pipe. According to the slow-closure type check valve provided by the invention, the rotary plate is fixedly connected onto the valve rod, the elastic rod with a rebounding function is arranged between the rotary plate and the valve body and is used for rebounding the valve clack, and when the valve clack is closed by the impact of a fluid, the elastic rod can provide a s