The present disclosure provides a pre-coated bottom cover combination machine for tile carpet comprising a carpet surface pre-coated processing line and a back bottom cover processing line. The back bottom cover processing line includes drive device for driving the carpet belt to move, black material feeding and automatic control device, scraper, white material feeding and automatic control device, composite device of bottom back and carpet surface, bottom back plasticizing and heating line, embossing device, carpet body water-cooled plate, carpet body water-cooled roller, carpet storage rack, deviation correction device, dicing machine, inspection table. The present invention can meet the requirements of reducing the manufacturing cost of tile carpets.