The invention relates to a process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide, which comprises the steps of producing the cyanuramide, refining bitterThe invention relates to a process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide, which comprises the steps of producing the cyanuramide, refining bittern or brine and absorbing tail gas, acidulating sodium bicarbonate to separate base out, separating the sodium carbonate, decomposing, rectifying and denitrifying the mother liquor of the sodium bicarbn or brine and absorbing tail gas, acidulating sodium bicarbonate to separate base out, separating the sodium carbonate, decomposing, rectifying and denitrifying the mother liquor of the sodium bicarbonate, steaming and concentrating deamination liquor to separate sodium chloride, and separating ammonium chloride from the clear solution of salt. The total utilization of the carbamide can be up toonate, steaming and concentrating deamination liquor to separate sodium chloride, and separating ammonium chloride from the clear solution of salt. The total utilization of the carbamide can be up to100 percent, the tail gas and considerable afterheat and steam generated in the cyanuramide production process can be fully utilized and the energy is saved.100 percent, the tail gas and considerable afterheat and steam generated in the cyanuramide production process can be fully utilized and the energy is saved.