Disclosed are a soft recoil system (200) and a cannon (100) having the same. The soft recoil system (200) includes: a cannon barrel returning device (210) mounted to a recoil device (160) for absorbing a recoil force occurring when ammunition is fired, and configured to backward press a breech ring (150) coupled to a rear end of the cannon barrel (120), such that the cannon barrel (120) is fixed to a preset position; a cannon barrel fixing device (220)installed at the recoil device (160), and configured to fix the cannon barrel (120) when the cannon barrel (120) returns to the fixed position; and a forward momentum generator (230) connected to the recoil device (160) and the breech ring (150), respectively, configured to forward move the cannon barrel by applying a force to the breech ring (150), such that the ammunition is fired while the cannon barrel (120) forward moves, and configured to reduce a recoil force by partially attenuating recoil momentum resulting from the firing of the ammunition, by forward momentum.