To ensure the scientific and effective drilling operation, a hook position monitoring system is designed based on LabVIEW. It can measure the hook position, provide real time display of hole depth, remanent distance of drilling rig, penetration rate and drill length. Meanwhile, a double channel hall sensors is installed on the crown block to detect the pulse signals, through the transformation of micro programming conversion by the digital display meter, serial port communication connecting PC and Labview platform, the data acquisition, analysis, presentation and storage are realized. The practice proves that this system has the advantages of convenient installation, high test precision and strong practicability and can be widely applied to the vertical drilling machine, rotary drilling rig and hydraulic drilling rig.