The present invention aims to provide a power box for transmission components in units of lines in seeding machines, the transmission components including at least one alternator, at least one hydraulic engine, at least one belt tensioner, at least one motor pulley, at least one alternating pulley, at least one belt and at least one battery, the box comprising: a cover, one structural box, and at least one fastening element. The structural body comprises at least two side plates, a bottom plate and a crosspiece so as to form between them an upper compartment and a lower compartment； the upper compartment comprising a first width； the lower compartment comprising a second width； the first width being wider than the second width.
