The invention discloses a particulate matter catcher regenerating device. The particulate matter catcher regenerating device comprises a particulate matter catcher and an oxidation catalytic converter. The particulate matter catcher and the oxidation catalytic converter are longitudinally perpendicularly arranged, an airflow swirling device (2) is arranged below the oxidation catalytic converter, and a particulate matter collector (3) is arranged on the airflow swirling device (2). By the adoption of the device, it can be guaranteed that the load of particulate matter inside a DPF is always low, and requirements of an aftertreatment system can be met without using an active regenerating system of the DPF and conducting manual ash removal. The invention further discloses a diesel engine with the regenerating device.