An apparatus for increasing power of a machine is provided to acquiring large power by connecting a plurality of short cranks with a plurality of long cranks. An apparatus for increasing power of a machine comprises a long crank(1-1) having a shaft, a short groove(26) and a long groove(25). A distance between the shaft and the short groove is 1m to 3m. A long crank(1-2) has a long groove, a shaft and a short groove. A device prevents the long crank from being bent by using a support and a reinforcing bar. A long crank(1-3) reciprocates in the left and right direction. A short crank(24-1) is connected with a rotating shaft(20) so that the short crank rotates as the rotating shaft rotates.
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