A continuous annealing equipment (101; 201) including: a cleaning device for performing a cleaning treatment on a steel strip; an annealing device for performing an annealing treatment on the steel strip; an exhaust gas passage (131; 231) through which an exhaust gas discharged from the annealing device flows; a solution circulation passage (132; 232) through which a cleaning solution used in the cleaning device circulates; a heat exchanger (153; 253) which forms a part of the solution circulation passage (132; 232) and contacts with the exhaust gas; a cleaning solution tank (121; 221) for storing the cleaning solution; a circulation pump (152; 252) configured to circulate the cleaning solution from the cleaning solution tank (121; 221) through the solution circulation passage (132; 232); a temperature sensor (121a; 221a) configured to detect a temperature of the cleaning solution stored in the cleaning solution tank (121; 221); and a control device (133; 233) configured to control an operation of the circulation pump (152; 252), based on a detection result detected by the temperature sensor (121a; 221a), characterised in that the continuous annealing equipment (101; 201) additionally comprises in the solution circulation passage (132; 232) at least one of a liquid-heating device using a heat source other than the exhaust gas discharged from the annealing device and being capable of heating the cleaning solution flowing through the solution circulation passage, and a liquid-cooling device using a heat source other than the exhaust gas discharged from the annealing device and being capable of cooling the cleaning solution flowing through the solution circulation passage, wherein the control device (133; 233) is configured to control an operation of the at least one of the liquid-heating device and the liquid-cooling device. a cleaning device for performing a cleaning treatment on a steel strip; an annealing device for performing an annealing treatment on the steel strip; an exhaust gas passage (131; 231) through which an exhaust gas discharged from the annealing device flows; a solution circulation passage (132; 232) through which a cleaning solution used in the cleaning device circulates; a heat exchanger (153; 253) which forms a part of the solution circulation passage (132; 232) and contacts with the exhaust gas; a cleaning solution tank (121; 221) for storing the cleaning solution; a circulation pump (152; 252) configured to circulate the cleaning solution from the cleaning solution tank (121; 221) through the solution circulation passage (132; 232); a temperature sensor (121a; 221a) configured to detect a temperature of the cleaning solution stored in the cleaning solution tank (121; 221); and a control device (133; 233) configured to control an operation of the circulation pump (152; 252), based on a detection result detected by the temperature sensor (121a; 221a), characterised in that the continuous annealing equipment (101; 201) additionally comprises in the solution circulation passage (132; 232) at least one of a liquid-heating device using a heat source other than the exhaust gas discharged from the annealing device and being capable of heating the cleaning solution flowing through the solution circulation passage, and a liquid-cooling device using a heat source other than the exhaust gas discharged from the annealing device and being capable of cooling the cleaning solution flowing through the solution circulation passage, wherein the control device (133; 233) is configured to control an operation of the at least one of the liquid-heating device and the liquid-cooling device.