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Since electromagnetic flowmeters must be in continuous operation, it is almost impossible to disassemble them and transport them to a **measurement and testing center for calibration. Therefore, it is necessary to verify the accuracy of large-diameter electromagnetic flowmeters. The accuracy calibration of electromagnetic flowmeters is highly beneficial for the management of such flowmeters, ensuring their accuracy and reliability, accumulating original comparison data, and facilitating future calibration tasks. The accuracy of electromagnetic flowmeters can be verified by using the volume of a clean water tank and electromagnetic flowmeter calibration equipment. A comprehensive verification of the accuracy of electromagnetic flowmeters is carried out to determine their accuracy when used in water treatment plants, thereby ensuring the reliability of the measurement data or deciding whether it is necessary to replace the electromagnetic flowmeters. Using visual inspection and instrument testing methods, the gs8 is employed to check whether parameters such as the excitation coil resistance of the sensor, the insulation resistance between signal wires, and the grounding resistance meet the factory specifications, as well as whether the zero point and output current of the electromagnetic flowmeter converter satisfy the accuracy requirements. The influence of the external environment on the operating accuracy of electromagnetic flowmeters, such as the installation of the excitation wires and signal wires in the same pipeline, their parallel placement with high-voltage cables, as well as the presence of large transformers or motors in the vicinity. This evaluation primarily uses visual inspection to check whether there are any sudden changes or fluctuations in the operation of the electromagnetic flowmeter, whether it is affected by electromagnetic waves or other stray waves, and whether there are bubbles in the pipeline.