Abstract: A kinetic energy multiplier rotary engine which operates by increasing the multiplied force of kinetic energy, which starts thanks to its accelerator and the rotary movement of its different sized masses that the kinetic energy rotary engine has in its structure. The purpose of this invention is to provide energy so that moving and/or electrical energy equipment will operate to provide a more practical, cleaner, less costly and less pollutant energy than the types of energy existing today, since the latter are costly and highly pollutant. This purpose is accomplished thanks to a simple innovative construction whose main characteristic consists of masses and magnets that provide rotary movement on the engine shaft.