The utility model discloses a device used for intelligent compensation of elongation of a load bearing steel wire rope of a cage. The device used for the intelligent compensation of the elongation of the load bearing steel wire rope of the cage comprises a programmable logic controller (PLC), a cage holding device arranged on the mouth of a well, and a cage weighing supporting tank arranged on the bottom of the well. Weighing apparatus is arranged on the trolley inlet side or on the trolley outlet side of the mouth of the well. The weighing apparatus and the cage weighing supporting tank are both in signal communication with the PLC. According to the device used for the intelligent compensation of the elongation of the load bearing steel wire rope of the cage, the weighing apparatus is arranged on the trolley inlet side or on the trolley outlet side of the mouth of the well on the premise that the original cage holding device on the mouth of the well is unchanged, loading weight can be measured through the weighing apparatus and is transmitted to the PLC, and weight measuring devices on the bottom of the well are kept unchanged. Therefore, construction working load and equipment invested cost of a mine are greatly reduced, practicality is good, and good economical benefit and social benefit can be achieved.