The invention discloses a device for adding diluent and inhibitor rapidly and uniformly in case of stirring failure. The device comprises a reaction tank, a first storage tank, a second storage tank and a third storage tank, the inhibitor is placed in the first storage tank, the diluent is placed in the second storage tank, cooling solvent is placed in the third storage tank, the first storage tank and the second storage tank are connected with the reaction tank through a main feed pipeline, a feed pump and an inlet valve are arranged on the middle segment of the main feed pipeline, the tail segment of the main feed pipeline is located below a stirring paddle, the tail segment is in a coil shape, and multiple feed holes are distributed in the coil surface; the reaction tank is connected with the third storage tank through a main discharging pipeline, a safety valve is arranged on the front segment of the main discharging pipeline, an outlet valve is arranged on the middle segment of the main discharging pipeline, the tail segment of the main discharging pipeline is located at the top of the reaction tank, the tail segment is in a coil shape, and multiple discharging holes are distributed in the coil surface. According to the device, by adding the diluent and the inhibitor into the reaction tanks, the occurrence of out-of-control reaction can be prevented rapidly.