The invention discloses a diesel particulate trapping and regenerating device with compound alcohol as auxiliaries. The diesel particulate trapping and regenerating device is composed of a compound alcohol storage tank, a compound alcohol pump, a first particulate-trap auxiliary regenerating module, a second particulate-trap auxiliary regenerating module, a particulate trap, an electric control unit and an exhaust state detection module; the first and second particulate-trap auxiliary regenerating modules and the particular trap are arranged on an exhaust pipe of a diesel, the first and second particulate-trap auxiliary regenerating modules are sequentially arranged on the front portion of the particulate trap, and the first particulate-trap auxiliary regenerating module is composed of a first compound alcohol injector and an oxidation catalyst. The diesel particulate trapping and regenerating device has the advantages that diesel consumption in the diesel can be made up after injection, auxiliary regeneration of the particulate trap can be realized, diesel consumption is decreased to a certain extent, and a good application prospect is achieved.