The invention discloses horizontal concentric double-layer sludge thin-layer drying equipment, belonging to the technical field of municipal sewage/sludge drying. The equipment comprises a left bearing (1), a left bearing cap (2), a left end cover (3), a steam pipe (4), a support wall (5), an external evaporation cylinder outer cylinder (6), an external evaporation cylinder inner cylinder (7), a horizontal scraper blade (8), an inclined scraper blade A (9), a heat conducting oil pipe (10), a right end cover (11), a scraper blade arm (12), a rotary wall (13), a right bearing cap (14), a rotating shaft (15), a right bearing (16), an internal evaporation cylinder support bearing (17), an internal evaporation cylinder outer cylinder (18), an internal evaporation cylinder internal cylinder (19), an inclined scraper blade B (20), a sludge outlet pipe (21), a sludge inlet pipe (22), a scraper blade arm restraint ring (23) and a scraper beam support bearing (24). The horizontal concentric double-layer sludge thin-layer drying equipment has the advantages of traditional thin-layer drying equipment; in addition, the axial length of the equipment is shortened, the layout of a plant can be improved, sludge with water content of 85%-70% can be dried into sludge with water content of 50%-35%.