The utility model provides a current sampling circuit for unipolarity H bridge drive direct current motor, includes voltage collector, H bridge circuit and bleeder circuit, and H bridge circuit includes direct current motor M, first bridge arm and second bridge arm, and first bridge arm and second bridge arm separately -driven direct current motor M just reverse. Internal resistance when this DC motor current sampling circuit utilizes the MOS piping to lead to ingeniously, voltage difference that the electric current produced on the MOS pipe in through MOS pipe Q3 or MOS pipe Q4 and bleeder circuit's cooperation for the first signal gathers port or the 2nd signal acquisition port 's the magnitude of voltage that voltage generation is different, thereby it also is exactly direct current motor's electric current to calculate the electric current that flows past the MOS pipe.