A frit sealing system and a method of manufacturing an organic light emitting display device by using the frit sealing system, and more particularly, a frit sealing system and a method of manufacturing an organic light emitting display device by using the frit sealing system, which includes a pressure member so as to physically pressurize a first substrate and a second substrate, thereby increasing adhesion of a frit when the first substrate and the second substrate are adhered to each other by using the frit. The frit sealing system, adhering the first substrate and the second substrate by using the frit, includes: a bed member on which the first substrate is placed; a laser irradiation member irradiating a laser to the frit between the first substrate and the second substrate; and a pressure member disposed on an upper part of the first substrate and the second substrate irradiated with the laser and adhered, thereby pressurizing the first substrate and the second substrate irradiated with the laser and adhered.