The present invention discloses an expansion sheet arrangement device for silicon steel sheet welding. The device comprises a pedestal which is provided with an expansion column mechanism for sleeving a silicon steel sheet through an elastic reset mechanism, the expansion column mechanism includes a central cylindrical driving stem, at least two chutes arranged at the outer wall of the driving stem at equal angle intervals and slanted kicking blocks matchingly arranged at each chute; the bottom of each slanted kicking block is contacted with the pedestal, the chutes and the corresponding slanted kicking blocks are attached and matched through a bevel inclined inwards from up to down, the slanted kicking blocks have the surfaces contacting with the silicon steel sheet and pressing covers located at the upper portion of the driving stem, and each pressing cover includes a cover body opposite to the top of the drive stem and a circle of pressing edges located at the bottom of the cover body and configured to press the silicon steel sheet; and when the pressing covers are pressing the drive stem downwards, the drive stem drives the slanted kicking blocks to slide to eject out of the chutes to expand and arrange the silicon steel sheet. The device is high in sheet arrangement neat degree, simple in structure and convenient to use, and can avoid the damaging of the silicon steel sheet while improving the work efficiency.