The invention provides a novel four-stroke four-cylinder layered dual-vortex combustion energy-saving internal combustion engine with a new gas distribution mechanism. In the internal combustion engine, four cylinder nozzle gaskets (14) and four small cylinder heads (13) with the new gas distribution mechanisms are arranged on four cylinders (28) of the conventional four-stroke vertical four-cylinder double overhead camshaft gasoline engine, and four small cylinders (37) are arranged inversely; two ports (35) are arranged in the front of the wall of each small cylinder (37); gas enters and is exhausted by up and down sliding of a small piston (39); and when big and small pistons (32, 45, 48, 52, 39) apply work simultaneously, gas exhaust is to push each small piston (39) and intake and exhaust turbines (66, 69, 73, 77) to apply work. The internal combustion engine has the advantages of simple structure, good lubricating condition, stable work, realizes that fuel vortex performs layered dual-vortex combustion in hot air interlayer, thereby having larger high-power output, saving fuel by about 50 percent, and reducing emission by 85 percent.