The invention discloses a novel energy injection system used for an intelligent walking assistant cane. The system comprises a human gesture measuring module, a cane module, and an energy injection device. The energy injection device supplements lost mechanical energy of the intelligent cane in movement caused by mechanical friction and ground collision through injecting energy, so that the intelligent cane can support a human body for periodic stable walking. The mechanism prevents a series of adverse effects of motor overheating, energy dissipation increment, impact generation, and bad stability caused by motor positive and negative rotation, and is beneficial for the intelligent cane to work stably for a long time.