The invention discloses a non-core Hall current sensor comprising a Hall sensor group arranged on a cable, a voltage follower connected to the Hall sensor group, a divider resistor connected to the voltage follower, a DSP signal processor connected to the divider resistor, and an oscilloscope connected to the DSP signal processor. The non-core Hall current sensor has the advantageous of solving the problem of core saturation and remanent magnetism in a core-type current sensor; being capable of non-contact measurement of current, having no additional losses, and being not affected by the conductor temperature; being simple in circuit, small in size, and light in weight, adopting electronic components to facilitate the integration, being free of a core and being small in size to facilitate the installation; being high in expandability, and being capable of selecting the Hall elements in different levels according to the level of the current to be measured to maintain the level and accuracy of the measurement; and being easy to install, and being directly sleeving the existing cable in an opening and closing structure without the need for disconnecting the cable connector.