The invention discloses a stable sailing device for a scenic spot sightseeing ship and a method. The stable sailing device comprises a ship body, a groove is formed in the bottom of the ship body, a balancing weight is arranged in the groove and connected with the ship body through a lifting mechanism which is a scissor-fork electric lifting mechanism, and balance adjusting mechanisms are arranged on two sides of the ship body. Shaking and side overturning of the ship body in case of stormy waves, ship unbalance or inclination can be prevented effectively, and ship traveling safety is guaranteed.