The utility model discloses an adjustable drill-crossing tower. The tower comprises a tower body, wherein the tower body comprises a lower-section tower body, a middle-section tower body and an upper-section tower body; the middle-section tower body is detachably connected with the lower-section tower body and the upper-section tower body; the overall height of the tower body is adjusted by replacing the middle-section tower bodies with different heights; the lower-section tower body is provided with a drilling side lower-layer tower head and a drilling side upper-layer tower head; the upper section tower body is provided with a spanning side lower layer tower head and a spanning side upper layer tower head, the drilling side lower layer tower head and the spanning side lower layer tower head are provided with strain strings connected with two phases of horizontal wires on the two sides, and the drilling side upper layer tower head and the spanning side upper layer tower head are provided with strain strings connected with one phase of horizontal wires on the two sides. According to the utility model, through the staggered arrangement of the front and rear side lines, crossing drilling and crossing can be simultaneously realized on one tower, and the rising transformation of a crossed line is avoided.