The invention discloses a system for direct-heat-exchange production of cyanamide by the utilization of a low-boiling-point organic solvent and a method thereof. According to the method, crushed lime nitrogen, a low-boiling-point organic solvent and carbon dioxide gas are introduced into a reactor and uniformly dispersed; temperature in the reactor is controlled to below 60 DEG C, and the low-boiling-point organic solvent is vaporized to directly absorb heat released from a reaction for cyanamide production; when pH of the reaction liquid is 9-10, the reaction is finished; organic solvent steam formed after heat absorption of the organic solvent is condensed by a condenser and the condensed product returns to an organic solvent storage tank to be recycled; reaction products are filtered to remove filter residue; and after filtrate phase-splitting treatment, a cyanamide aqueous solution and a low-boiling-point organic solvent are obtained. by boiling of the low-boiling-point organic solvent, heat released from the reaction is directly absorbed, temperature gradient in the reactor is eliminated, reaction temperature is controlled to below 60 DEG C, and generation of dicyandiamide is reduced. Without cooling water, equipment scaling problem caused by indirect cooling is avoided, energy consumption is lowered, and water resources are saved.