Abstract: With the increasing contradiction between resource supply and demand, searching deep resources will become our key work in resources exploration. The advantage of surface drilling monitor is distinct as it is able to detect and monitor the drilling parameters in real time during deep drilling, while the testing of hook position remains difficult. This paper designs a hook position detector, which installs double channel hall sensors on the crown block to detect the pulse signals, after the transformation of micro programming system within the digital display header, the hander connects PC by serial port and can carry out the acquisition, analysis, presentation and storage of the data based on the LabVIEW platform. We can reap the following benefit by using this detector, test the remaining distance of drilling rig directly, judge the position of the hook in case it crashes into the crown block and calculate the racking platform position for easier putting on and putting off the hoisting swivel elevator. Our deep drilling test in filed has proved that this equipment is easy to install and accurate. It is handy to be applied to detect the hook position of vertical drilling rig and rotary drilling rig.