The utility model discloses an outdoor high-voltage alternating-current ground switch with high-parameter switching-induced current, which consists of three monopoles forming three phases, wherein each monopole comprises a main grounding loop and an auxiliary grounding loop; the main grounding loop comprises an electromotor operation mechanism (1), a steel support (2), a pedestal (4), a lower knife tube (5), a coupling (6), an upper knife tube (7) and supporting insulators (8); and the auxiliary grounding loop comprises an arc distinguish chamber operation mechanism (3), a moving arcing contact (9), an insulated idler wheel (10), a static arcing contact (11), a cable (14) and an SF6 arc distinguish chamber (16). Since the utility model designs the grounding knife tube into the foldable upper and lower knife tubes, operates cooperatively with the auxiliary loop, improves the electrically connected parts and adopts the SF6 arc distinguish chamber and electrical linkage, the utility model is characterized by steady and reliable action, low switch-on impact, high technical parameter, excellent electrical performance, good anti-corrosion property, easy operation, long service life and the like.