The invention discloses a depth-control drill test device and test method for a PCB. The device and the method are characterized in that a test plate is fixed on a drill table-board, and comprises a first backing board, a second backing board, a third backing board and a cover plate which are stacked sequentially; the thickness H 1 of the third backing board is a difference subtracting 3a from H, both the thickness A1 of the first backing board and the thickness A2 of the second backing board are equal to 2a, H is a preset hole depth, and a is a tolerance value; test holes are processed in the test plate; the first backing board is placed on a luminous platform, whether each test hole is light-transmitting is observed, and if yes, the test hole is disqualified; and the second backing board is placed on the luminous platform, the second backing board is covered with a hole site map, whether each hole site is light-transmitting is observed, and if not, the test hole corresponding to the hole site is disqualified. The test method provided by the invention can confirm that whether the depth-control accuracy of all holes meets requirements simply and effectively through the light-transmitting tests of the first backing board and the second backing board, and the test for various types of depth-control accuracy can be achieved through using backing boards with different thicknesses.