The utility model discloses a multifunctional silencer, which is provided with an A chamber, a B chamber, a C chamber and a D chamber, wherein the A chamber is used for distributing waste gas uniformly; the B chamber is used for decomposing and purifying harmful chemical substances in the waste gas; the C chamber is used for collecting electrostatic smoke particles and dusts in the waste gas; the D chamber is used for reducing the noise generated by the waste gas flow; the A chamber, the B chamber, the C chamber and the D chamber are connected and communicated in sequence; the A chamber is communicated with the B chamber by a plurality of gas flow ports; the B chamber is communicated with the C chamber by a flow guide pipe; and the C chamber is communicated with the D chamber by a U guide pipe capable of guiding the gas flow. The waste gas exhausted by an automobile enters and exits the B chamber uniformly through the A chamber, harmless purification treatment is chemically carried out by the B chamber, dust collection is carried out by the C chamber, tail gas is cooled by cooling chambers arranged at the peripheries of the C chamber and the D chamber, then the purified, dust-collected and cooled tail gas is denoised by the D chamber, and the influence of the tail gas of the automobile on the environment is reduced.