Ditching and pipe burying machine for sewage treatment

The utility model discloses a sewage treatment trenching and pipe burying machine which comprises a mounting cross arm horizontally mounted on carrying equipment and a blow-off pipeline, a pair of sliding blocks are arranged on the bottom end face of the mounting cross arm in a sliding mode, auxiliary structures are arranged at the bottom ends of the sliding blocks, and the blow-off pipeline can be driven to be horizontally placed through the auxiliary structures; the auxiliary structure comprises a pair of clamping arms which are vertically and slidably connected to the bottom end of each sliding block, the blow-off pipeline is located between the pair of clamping arms, fixing plates are arranged on the two sides of the blow-off pipeline, and clamping seats matched with the fixing plates are arranged at the bottom ends of the clamping arms; the bottom end of the sliding block is provided with an adjusting assembly for the pair of clamping arms to move oppositely, the adjusting assembly comprises a second scr