The invention relates to a full-automatic decelerating clutch of a washer. The full-automatic decelerating clutch comprises a shell consisting of an upper end cover and a lower end cover; a brake wheel, a clutching device, an electromagnetic coil, a clutching spring, a lower clutching gear, a driving shaft, a first output shaft and a second output shaft are arranged in the shell, wherein the first output shaft and the second output shaft are respectively connected with an inner cylinder and an impeller of the washer; the lower clutching gear is tightly matched inside the lower end cover; the clutching device is arranged between the brake wheel and the lower clutching gear; the first output shaft and the second output shaft are connected with the brake wheel; the clutching device moves axially by power on and power off of the electromagnetic coil and is selectively clamped with or released from the lower clutching gear, the brake wheel and the driving shaft so that the first output shaft and the second output shaft rotate oppositely during washing and rotate in the same direction during dehydration. The full-automatic decelerating clutch disclosed by the invention is relatively simple in structure, simplified in production and assembly processes and lowered in production cost; meanwhile, the washing and dehydration work conditions are automatically switched by the clutching device; the braking force is more stable, so the reliability, balance and stability of the washer in driving can be improved.