The invention relates to a converter overvoltage and overcurrent fault alarming protective circuit and belongs to the technical field of converters. The converter overvoltage and overcurrent fault alarming protective circuit comprises a voltage reference circuit, a direct-current voltage fault alarming circuit, a direct-current current fault alarming circuit, a three-phase alternating-current voltage fault alarming circuit, a three-phase alternating-current current fault alarming circuit, and a fault signal latching and processing circuit. The voltage reference circuit is connected with the direct-current voltage fault alarming circuit, the direct-current current fault alarming circuit, the three-phase alternating-current voltage fault alarming circuit and the three-phase alternating-current current fault alarming circuit respectively so as to supply reference voltage to the same. The direct-current voltage fault alarming circuit, the direct-current current fault alarming circuit, the three-phase alternating-current voltage fault alarming circuit and the three-phase alternating-current current fault alarming circuit are connected with the fault signal latching and processing circuit. The converter overvoltage and overcurrent fault alarming protective circuit automatically starts a protection mechanism without being controlled by a CPU (central processing unit), so that the protection function can be started in case of CPU failure, and the converter overvoltage and overcurrent fault alarming protective circuit is quick in response and functions in protecting a converter itself and external equipment.