The invention discloses a Hall current sensor which includes a shell, wherein an annular mounting part and a circuit board are arranged in the shell; an annular iron core is arranged on the annular mounting part; a coil is wound outside the annular iron core; a notch is formed in the annular iron core; a Hall element is arranged in the notch; the Hall element and the coil are electrically connected with the circuit board; the circuit board is used for leading a connecting wire out of the shell through a pin header; a cooling device is also arranged in the shell; the cooling device comprises asemiconductor chilling plate, a cooling ring, a temperature sensor, a processor and a power regulator, the semiconductor chilling plate and the cooling ring are glued through heat conduction siliconegrease, the temperature sensor, the power regulator and the semiconductor chilling plate are all electrically connected with the processor, and the processor is further electrically connected with thecircuit board. The Hall sensor has the advantages that the Hall element is effectively cooled through the cooling device, and the use accuracy of the Hall sensor in the environment with the high temperature is improved.