The invention discloses a multi-cylinder diesel engine crankshaft and a manufacturing method thereof. The multi-cylinder diesel engine crankshaft comprises a main journal, cranks and connecting rod journals, wherein the multiple cranks parallel to one another are connected to the main journal; every two adjacent cranks are connected by virtue of a connecting rod journal; the multi-cylinder diesel engine crankshaft is characterized in that a balance block is arranged at one end, which is far away from the center of the connecting rod journal, of each crank; the balance blocks are of symmetrical arcs; the symmetrical center line of the balance blocks and the axis of the crankshaft main journal and the connecting rod journals are not positioned on the same line, and form an acute angle. The balance blocks are of the symmetrical arcs, the balance mass on each crank arm is not the same, mass-radius products are in symmetrical or asymmetrical distribution, the overall balance effect of the crankshaft can be achieved when all the mass is added together, the total mass of the counterweight of the balance blocks can be effectively reduced, the internal force and the internal bending moment of the crankshaft can be minimized, namely the aim of wholly lightening an engine is achieved, and the reliability of the crankshaft can be guaranteed.