Auxiliary installation tool for building drainage pipeline

The invention discloses an auxiliary installation tool for a building drainage pipeline, relates to the technical field of drainage pipe installation, solves the problems that an existing clamp is low in installation efficiency and has certain errors due to the length of expansion screws, and comprises a plurality of expansion screws connected with a wall in an inserted mode and an installation frame connected with the expansion screws in a butt joint mode. A butt-joint frame is fixed to the bottom of the mounting frame located at the uppermost end, and a supporting mechanism is mounted in the butt-joint frame and used for supporting the drainage pipe; according to the clamping hoop, an existing clamping hoop is optimized, the designed clamping piece is directly arranged on the outer side of the drainage pipe in a clamped and sleeved mode and then moves downwards to be directly inserted into the installation frame, the clamping piece is matched with the self-locking mechanism, and therefore the drainage pipe