Comprehensive logging instrument depth metering device with small error

The utility model discloses a comprehensive logging instrument depth metering device with small error, which relates to the field of exploration and comprises a base, a vertical shaft is arranged on the left side of the top of the base, a gyrator is sleeved at the bottom of the surface of the vertical shaft, and a connecting plate is sleeved on the surface of the vertical shaft and positioned at the top of the gyrator. Scales are arranged on the two sides of the top of the connecting plate, and a first pulley is arranged on the right side of the connecting plate. During well drilling, the steel wire rope is stretched and released through lifting of the vertical shaft, the steel wire rope moves downwards and slides on the surface of the first pulley under the gravity action of the weight bearing block, meanwhile, the first pulley is protected by the first protection plate, the steel wire rope drives the second pulley to rotate, and the second pulley drives the logging instrument to rotate. The logging instrume