Aiming at the problem that the bandwidth of large-range hall current sensors cannot be tested with high currents of different frequencies due to the limitation of detection equipment, a bandwidth detection circuit is designed and the relationship between the bandwidth of large-range hall current sensors and the test current is explored. A large range pulse test current of different frequencies can be obtained by chopping the DC high current through the bandwidth detection circuit, which flows through the hall current sensor and the constantan wire array. According to the -3 dB principle, the distortion degree of the output signal amplitude of the hall current sensor relative to the condon wire array is compared, and the bandwidth of the hall current sensor is determined. The bandwidth of the hall current sensor was tested by using 30～100 A test current of different sizes, and the results showed that the test current was different, the bandwidth of the large-range hall current sensor was different, and the bandwidth gradually decreased with the increase of the test current.