The invention discloses a steel coil DC magnetic performance measurement device and a method. The steel coil DC magnetic performance measurement device comprises an automatic winding device and two mutually-parallel conveyor belts, and is characterized by further comprising an inverted U-shaped primary-secondary winding arranged above the conveyor belts and a bottom groove rail arranged below the conveyor belts; two bottom ends of the primary-secondary winding pass through a gap between the two mutually-parallel conveyor belts and contacted with the below bottom groove rail to form a closed loop; the primary-secondary winding is provided with a voltage meter, a current meter and a magnetic fluxmeter; and the voltage meter, the current meter and the magnetic fluxmeter are connected with a data analysis module. The steel coil DC magnetic performance measurement device has the beneficial effects of simple structure, convenient and simple operation and accurate measurement.