A multifunctional tool and a core structure thereof are provided. The core structure comprises a central frame as well as a power mechanism and a transmission system mounted to the central frame. The central frame includes an extension (22) located in a front portion of the central frame as a base to fix various working assemblies. The core structure further comprises a reciprocating movement platform, the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection interface being entirely located within the extension, and the transmission system transmits power output by the power mechanism to the reciprocating movement platform so that the reciprocating movement platform makes reciprocating movement forward and backward with respect to the central frame and drives the work executing element connected to the connection interface to make desired movement. The core structure is connected to working assemblies with different functions and specifications and the operation of replacing the working assemblies is simplified and facilitated.Linvention concerne un outil multifonctionnel et sa structure centrale. La structure centrale comprend un cadre central, ainsi quun mécanisme dalimentation et un système de transmission montés sur le cadre central. Le cadre central comprend une extension (22), située dans une partie avant du cadre central, comme base pour fixer divers ensembles de travail. La structure centrale comprend en outre une plate-forme de mouvement en va-et-vient, la plate-forme de mouvement en va-et-vient peut être reliée à une extrémité arrière dun élément dexécution de travail de divers ensembles de travail par lintermédiaire dune interface de liaison disposée sur une extrémité avant de la plate-forme de mouvement en va-et-vient, linterface de liaison étant disposée entièrement dans lextensio
