The invention discloses an automobile exhaust muffler, and relates to the technical field of automobile manufacturing. The automobile exhaust muffler comprises a muffler inner inserting tube providedwith a muffling tube portion, muffling holes are distributed in the tube wall of the muffling tube portion, the muffler inner inserting tube is sleeved with a muffler housing, and muffling cotton is arranged between the muffler housing and the muffler inner inserting tube; the muffler inner inserting tube is provided with a reinforcing tube portion for dividing the muffling tube portion into two segments, and the reinforcing tube portion is provided with reinforcing ribs. Compared with the prior art, the muffler inner inserting tube is provided with the reinforcing tube portion for dividing the muffling tube portion into the two segments, and the reinforcing tube portion is provided with the reinforcing ribs; the overall strength of the muffler inner inserting tube is improved, and the conditions that common rotating speed frequency coupling happens to the muffler inner inserting tube and an overall automobile, and consequently the muffler inner inserting tube happens fatigue breakingand efficiency losing due to long-term vibration transmission are avoided, and abnormal noise is eliminated.