Novel crankshaft used for engine

The invention discloses a novel crankshaft used for an engine. The novel crankshaft comprises a front main shaft bearing and a rear main shaft bearing which are arranged at the two ends of a shaft rod of the crankshaft. At least two crank throw units connected through the main shaft bearings are arranged between the front main shaft bearing and the rear main shaft bearing. Each crank throw unit comprises three cranks which are arranged in parallel. Crank throws are arranged between the cranks. The centers of every two adjacent crank throws are arranged at the upper end and the lower end of the corresponding crank respectively. The novel crankshaft solves the problem that in the prior art, the total length of the crankshaft is too large, so that an engine mechanism can be more compact; and the problem that the bending rigidity and the torsional rigidity are low due to the fact that the crankshaft is too long is solved.