The invention discloses an emission reduction silencing valve for a car silencer. The emission reduction silencing valve for the car silencer can solve the problem that a valve cover of the valve cannot be smoothly reset due to the fact that a spring is prone to deforming or even failing when a traditional valve for a silencer works, in the process of driving the valve cover of the valve to resetby a spring, the valve cover collides with a discharge opening of the valve when the valve cover is closed each time due to the elasticity of the spring, the collision generates noise to affect the silencing effect of the silencer and the valve cover is extremely prone to being damaged due to the collision; and meanwhile, the valve body is extremely vulnerable to unstable vibration and noise caused by gas circulation when high-pressure gas flows in the valve body due to the fact that a valve body lacks a structure for fixing the valve body. The mission reduction silencing valve for the car silencer comprises a valve body and a fixing assembly positioned at the bottom of the valve body, wherein a control assembly is installed on the valve body; an air inlet end is arranged at one end of thevalve body; an air outlet end is arranged at the other end of the valve body; and a discharge opening is formed in the middle portion of the side wall of the air outlet end. The emission reduction silencing valve for the car silencer is more stable in work and can further play a role in silencing.