The invention discloses a fire-fighting bomb launching method. According to the fire-fighting bomb launching method, symmetric double friction wheels are adopted for friction launching of fire-fighting bombs. The double friction wheels are symmetrically arranged on the two sides of the launching area, after the fire-fighting bomb enters the launching area, the double friction wheels make contact with the two sides of the fire-fighting bomb, and the fire-fighting bomb obtains the initial running speed and is launched out through rotation of the double friction wheels. An existing fire-fighting bomb launching mode is changed, and the unsafe defect existing in compressed gas launching, elastic force launching, fire blast launching, gunpowder launching, electromagnetic launching and the like is overcome. On the premise of guaranteeing the safety, the fire extinguishing device is simple in design, the manufacturing cost is reduced, and the fire extinguishing effect is improved. The long-body fire-fighting bomb launcher can launch a long-body fire-fighting bomb and can also launch a spherical bomb, the shooting precision can be improved, and the shooting error can be reduced.