Oil well depth measuring device

The utility model belongs to the technical field of oil wells, and particularly relates to an oil well depth measuring device which comprises a digital measuring system and a mechanical measuring system, a guide wheel assembly is connected between the digital measuring system and the mechanical measuring system, and the guide wheel assembly comprises an upper frame body and a lower frame body. A counting wheel is rotatably connected to the bottom of the upper frame body, a pressing wheel is rotatably connected to the top of the lower frame body, and upper connecting plates are connected to the two ends of the bottom of the upper frame body; according to the oil well depth measuring device provided by the utility model, the distance between the counting wheel and the pressing wheel can be increased by synchronously rotating the two groups of screw rods to enable the lower frame body to move downwards, so that a worker can enable a steel wire rope carrying a balancing weight to pass through the space between th