The invention discloses a device for producing transparent conductive coated glass on a floating method line. The device comprises an annealing kiln (40) and a coating device (10) arranged in the annealing kiln (40), wherein the annealing kiln is further internally provided with a laser device for performing photoinduced dissociation on a precursor gas output from the coating device; the laser device comprises a lifting table (21) arranged on one side of the annealing kiln; a laser (22) and a corresponding mask plate (23) are arranged on the lifting table; an incident window (24) and an emergent window (25) which are corresponding to the mask plate are respectively arranged on two sides of the annealing kiln; a laser beam (27) from the laser to the annealing kiln is positioned between the bottom of the coating device and a glass plate (41) in the annealing kiln; a laser power meter (26) corresponding to the emergent window is arranged on the other side of the annealing kiln. The device adopts laser to promote chemical gas phase reaction, can be used for reducing the temperature of coating reaction and has beneficial effects in improving the coating quality, improving the precursor gas utilization rate, reducing the energy consumption of a tin tank and the consumption of a tin liquid, lowering the manufacturing cost of the coating device and alleviating the operation difficulty.