Abstract: The present disclosure discloses a device and a method for measuring gas chemical solvent absorption and desorption reaction heat. The device comprises an outer casing; an metal guard inner shell; a reactor; a pressure sensor; a thermal insulation material between the outer casing and the metal guard inner shell; guard electric heaters provided respectively in an upper portion and a lower portion of an outer periphery of the metal guard inner shell; a glass fiber thermal insulation layer between the inner metal guard shell and the reactor; temperature thermocouples provided in the glass fiber thermal insulation layer; a glass fiber board provided in a lower portion of an outer periphery of the reactor; main electric heaters between the glass fiber board and the reactor; a liquid inlet pipe and a gas discharge pipe; a temperature thermistor, a liquid discharge pipe; a data acquisition board; a computer; and a power supply.