The invention discloses a multi-industrial-bus data transmission system, and relates to the technical field of data transmission. The system comprises a processing chip built in a welding and cuttingpower supply, a multi-industrial-bus protocol converter and industrial bus equipment; the processing chip is connected with the multi-industrial-bus protocol converter through a first line; and the multi-industrial-bus protocol converter is connected with the industrial bus equipment through a second line. The problem that data link requirements in different industrial fields cannot be satisfied when the welding and cutting power supply only can realize a single industrial bus protocol can be solved; and thus, multi-industrial-bus data transmission can be realized.