The invention discloses a multi-group parallel connection proximate matter stacking system comprising an inputting lifting table and a stacking device. The stacking device comprises a plurality of racks arranged in parallel; hoisting arms are hinged to the racks through first hinged shafts; the lower ends of the hoisting arms are connected with a cross beam; a plurality of wrist parts are hinged to the lower side of the cross beam through second hinged shafts at intervals and are rotationally connected with overturning magnets which are provided with clamping and fixing mechanisms; and the racks are provided with a synchronous driving device, and the wrist parts are kept horizontal through a wrist part horizontalness keeping mechanism. The inputting lifting table comprises a plurality of inputting lifting table bodies which are provided with positioning stop dogs; the synchronous driving device comprises a synchronous shaft which is provided with a plurality of rockers corresponding to the hoisting arms one to one, a plurality of driving connection rods and a synchronous shaft driving mechanism, the two ends of each driving connection rod are hinged to the corresponding hoisting arm and the corresponding rocker, and the rockers are in anti-rotating connection with the synchronous shaft. The multi-group parallel connection proximate matter stacking system is applicable to the stacking requirement of small-specification structural steel free of the posture change in the stacking process.