The invention relates to a construction method of a tile roofing of an ancient building, which can effectively solve the problems of difficultly realizing high efficiency and low cost and difficultly guaranteeing of restoration quality for the tile roofing of the ancient building. The construction method comprises the following steps of treatment of the tile roofing: cleaning a base layer of the tile roofing, and cleaning a plastered grey cement back; selecting and classifying tiles for the tile roofing, soaking, fetching out, and airing; centering a roof plane, forming a ridge, arranging eaves tiles, and performing planar positioning; tile paving at the roof: punching edge ridge tiles, paving eave edge tiles, tying tile ridge lines, paving bottom tiles, paving cover tiles, and tightly plastering and flatting joints; arranging a tile surface, cleaning a roof ridge, and preventing the pollution of cement mortar to a glaze surface, so as to maintain the cleanliness and brightness of the tiles. The construction method has the advantages that the construction efficiency is high, the cost is low, the overlapping of the tile roofing is tight and firm, lines and rows are regularly transverse and vertical, the protruding lengths of the eave head tiles are uniform, the slope of a tile surface is smooth and straight, and the visual effect is good; the waste caused by inaccurate size during cutting is avoided, the loss is reduced, the pollution to environment is avoided, and the huge economic and social benefits are realized.