The invention relates to a coil detection apparatus and a detection method thereof. A coil exposed surface insulation layer damage detection apparatus comprises a detection power supply, one end of the detection power supply is connected with one end of a first lead, the other end of the first lead is connected with a conductive clamp, the other end of the detection power supply is connected with one end of a second lead, the other end of the second lead is connected with a conductive brushing hair bundle, and the cross section area of brush hair forming the brushing hair bundle is below 0.4mm<2>. The conductive brushing hair bundle is used to brush the above coil in order to determine whether the insulation layer is damaged or not depended on sparking appears or not. The coil exposed surface insulation layer damage detection apparatus for conveniently detecting whether the coil exposed surface insulation layer is damaged or not and the detection method thereof are provided to solve the disadvantages of a method for directly observing whether the coil exposed surface insulation layer is damaged or not through eyes.