The invention discloses a DC (direct current) magnetic bias detection device capable of overcoming AC (alternating current) magnetic field interference. The device comprises a box body, wherein two rotating shafts are horizontally, symmetrically and rotationally connected into the box body; rotating block are symmetrically and fixedly connected onto the two rotating shafts respectively; the upperends, far away from the rotating shafts, of the rotating blocks extend above the box body; two first detection rings and two second detection rings are symmetrically arranged at the upper end of the box body; the first detection rings are opposite to the second detection rings; the first detection rings and the second detection rings are fixed on the rotating blocks; a fixing mechanism is arrangedat one end of each second detection ring; the second detection rings are connected with the first detection rings through detection mechanisms; and the lower ends of the rotating blocks are fixedly connected with connecting rods. The device is stable in structure, simple to operate, scientific and reasonable in design, and short in production period; simple mounting detection is convenient duringdetection; and the detection is relatively simple.