The invention discloses an electromagnetic welding construction method for a tunnel waterproof plate. The electromagnetic welding construction method for the tunnel waterproof plate comprises the steps that 1, a primary supporting face is pretreated; 2, a geotechnical cloth buffering layer is laid on the primary supporting face and fixed to the primary supporting face through multiple hard plasticgaskets; 3, the waterproof plate is laid on the geotechnical cloth buffering layer; and 4, the waterproof plate is electromagnetically welded with an electromagnetic welding machine, specifically, the waterproof plate is compressed and closely attached to the primary supporting face, an electromagnetic welding machine gun head is aligned with one hard plastic gasket and compresses the hard plastic gasket, after the electromagnetic welding machine is started, the hard plastic gasket and the waterproof plate are molten and adhered together, the electromagnetic welding machine gun head stopped,and welding between all the hard plastic gaskets and the waterproof plate is sequentially completed, wherein, a layer of an iron wire net is fixed to the outer surface, attached to the waterproof plate, of each hard plastic gasket. The electromagnetic welding construction method for the tunnel waterproof plate has the advantages of being good in welding effect, high in construction efficiency andthe like and can be widely applied to the technical field of tunnel waterproof plate construction.