The invention discloses a diversion and noise-reduction type vehicle tail gas purifier. According to the scheme, the diversion and noise-reduction type vehicle tail gas purifier comprises a gas exhaust tube, wherein one end of the gas exhaust tube is a gas inlet; the other end of the gas exhaust tube is a gas outlet; the inner wall of the gas exhaust tube is provided with diversion plates which are inclined towards the gas outlet; the diversion plates are symmetrically arranged in the gas exhaust tube in a radial direction; one end of each diversion plate is provided with a ceramic honeycomb plate in an axial direction of the gas exhaust tube; and one end of each of the two symmetrical ceramic honeycomb plates is fixed with a partition plate. The invention aims to provide the diversion and noise-reduction type vehicle tail gas purifier, so that all of the tail gas can flow through the ceramic honeycomb plate through diversion of the partition plate while filtered.