The invention relates to a welding system, in particular to a universal flower basket welding system compatible with various flower basket shapes and sizes. The universal flower basket welding systemcomprises a bottom plate, a heating point base, a heating point, a toothed bar bottom plate, a toothed bar base plate group, a toothed bar guide block, a side toothed bar group, toothed bar positioning blocks and a hot melting mechanism. The bottom plate is in sliding fit with a heating point adjusting seat, the heating point is arranged on the heating point base, the toothed bar base plate groupis mounted on the toothed bar bottom plate and comprises a first toothed bar base plate, a second toothed bar base plate, a third toothed bar base plate and a fourth toothed bar base plate, the firsttoothed bar base plate is connected with the third toothed bar base plate through the toothed bar guide block, the toothed bar positioning blocks are mounted on the first toothed bar base plate, the second toothed bar base plate, the third toothed bar base plate and the fourth toothed bar base plate in a sliding fit manner, the side toothed bar group comprises a first side toothed bar and a secondside toothed bar, and the first side toothed bar penetrates the toothed bar positioning blocks on the first toothed bar base plate and the second toothed bar base plate.