Can you imagine that when you slide on the polymer plate with your hands, the generated electromagnetic field can drive 28-watt fluorescent tube lamps and can even charge the mobile phone? The progress of science and technology subverts traditional cognition. In this work, the easiest and efficient power generator (EEPG) in the world, with ultrahigh voltage is invented, which can light up several 1-watt bulbs and 28-watt fluorescent tube lamps by simply rubbing a polymethyl methacrylate (PMMA) plate with hands or other objects. The average output voltage and current of planar EEPG can reach up to nearly 5000 V and 116 μA respectively. Not only can it be used for lighting, but also for charging, and even for mobile phones. The rotary EEPG can be used to harvest the wind energy and tidal energy, which overcomes the shortcomings of traditional electromagnetic wind power generation working only when the wind speed is greater than 5 m/s. In addition, as a self-powered system, the EEPG power generator can be utilized as foot switch and trajectory tracking tool. Further analyses on its working principle of EEPG power generator were proposed. This is likely to become the easiest and the most effective method of power generation in the world up to now, which will have great significance in the field of new energy and self-powered systems. We can expect that, in the near future, we can charge our mobile phones by just rubbing their backs. Collecting the green wind energy more easily and efficiently will be truly realized.