Drilling device for casting part

The drilling device comprises a bottom box, a first fixing plate is fixed to the left side of the upper end of the bottom box, a second fixing plate is installed at the position, symmetrical to the first fixing plate, of the right side of the upper end of the bottom box, and sliding grooves are formed in the inner side of the first fixing plate and the inner side of the second fixing plate correspondingly; and adjusting cross beams are mounted on the inner sides of the first fixing plate and the second fixing plate. The adjusting cross beam which is connected in a front-back sliding mode is arranged between the two fixing plates, the adjusting blocks which slide left and right are arranged on the cross beam, the drilling position can be adjusted and fixed according to needs, the position of a casting piece does not need to be changed, operation is easy, the machining efficiency is improved, and the limiting plate is of an L-shaped structure. And the supporting seat with the adjustableheight is arranged at the