With the development of highprecision fluxmeters, the limitations of existing fluxmeter calibration methods have become increasingly prominent. Aiming at the deficiencies of existing mutual inductance methods and standard coil methods, a fluxmeter calibration device based on voltsecond method is designed. The device adopts a lownoise circuit architecture and uses the FPGA to control the highspeed DAC to output standard magnetic flux. Through testing and analyzing the transient process of voltage, pulse width and level changes of the voltsecond generator, the relative expansion uncertainty of the generated 1 mWb~10 Wb standard magnetic flux is better than 001%. In the cases where the voltsecond products are the same, the larger the output voltage pulse amplitude and the smaller the pulse width, the smaller the relative expansion uncertainty of the output standard magnetic flux will be. However, in calibration process, the voltsecond output combination should be selected reasonably according to the integral response characteristic of the calibrated fluxmeter. The proposed method and traditional mutual inductance method, standard coil method were used to calibrate the same fluxmeter and the results were compared. The results show that the accuracy of the voltsecond method is better than that of the traditional standard coil method. The calibration range of the voltsecond method is better than that of the traditional mutual inductance method, its calibration range reaches 1 mWb~10 Wb, which can meet the calibration requirements of the fluxmeters of class 01 and below.