The present disclosure relates to a charging system and a charging method for an automatic force detection robot for a gas pipeline. The charging system includes a primary charging unit disposed outside the gas pipeline and a secondary charging unit disposed in the gas pipeline, wherein the primary charging unit includes a primary magnetic core and a primary coil wound on the primary magnetic core, the secondary charging unit includes a secondary magnetic core and a secondary coil wound on the secondary magnetic core, the primary magnetic core and the secondary magnetic core form a closed magnetic field line, the primary coil is connected to a power supply, and the secondary coil is connected to a battery of the robot. The charging system has the advantages of simple structure, low cost, convenient use, strong anti-interference capability and high charging efficiency, solves the problem that the cableless automatic force detection robot needs to overcome the shielding of the pipeline wall when charging, and improves the capability of the cableless automatic force detection robot when carrying out a long-distance detection in the pipeline. The charging method has the advantages of easy implementation, convenient operation, safety and reliability, and high charging efficiency.