The invention provides a waste edge trimming device used for a large infusion soft bag production line, comprising a compacting part which is fixed on a frame, a recovery part and more than one group of trimming parts; the upper trimming pin part and the pressing film part of the trimming part are arranged above a film supporting plate and the lower trimming pin part thereof is arranged below the pressing film part and at a position symmetric to the upper trimming pin part; the upper trimming pin part is connected with a trimming cylinder; the compacting part is arranged at one side of the trimming part and comprises an upper compacting die, an auxiliary pressing block, a compacting cylinder and a lower compacting die; the lower compacting die is arranged on the film supporting plate; the auxiliary pressing block and the upper compacting die which is arranged symmetrically to the lower compacting die is arranged above the film supporting plate; the recovery cylinder of the recovery part is connected with a recovery fork by a recovery plate; the recovery fork is arranged below the film supporting plate and at the position corresponding to the compacting part. The waste edge trimming device of the invention has the advantages of simple and compact structure, low cost, simple action, stable running of the whole machine, high production efficiency, etc.