The invention discloses a full-automatic flattening machine for flattening after clothes washing. The tail end of a feeding hopper is communicated with a feeding inlet of an elastic force scattering cavity, no end face exists at the bottom of the elastic force scattering cavity, an elastic net is fixedly arranged at the bottom of the elastic force scattering cavity, a push-pull plate is arranged below the elastic net, the bottom face of the push-pull plate is fixedly connected with a column head of a telescopic pump, a discharging hole in one side of the elastic force scattering cavity is connected with a flattening scattering mechanism through an inclined way, the flattening scattering mechanism comprises an inclined screen movable bed, an oscillator, a flattening pusher and barrier plates, the inlet end of the inclined screen movable bed is connected with the tail end of the inclined way, the barrier plates are arranged on the two opposite sides of the inclined screen movable bed, the oscillator is arranged at the bottom of the inclined screen movable bed, and the flattening pusher is arranged between the inclined screen movable bed and a cloth conveyor belt. The labor intensityof workers is relieved, the working efficiency is improved, the clothes flattening flatness is ensured, the manual waste is lowered, and the automatic degree is high.