The invention discloses a secondary oil cylinder of a
wood splitting machine, which comprises a cylinder
barrel, a cylinder base plate, a primary guiding sleeve, a primary
piston, a primary
piston rod, a secondary guiding sleeve, a secondary
piston and a secondary
piston rod. The primary piston is arranged in the cylinder
barrel, the primary guiding sleeve is mounted at the top end of the cylinder
barrel, the primary
piston rod comprises an inner barrel and an outer barrel, bottom ends of the inner barrel and the outer barrel are respectively fixedly connected with the primary piston, the outer barrel penetrates through the primary guiding sleeve, the secondary piston is disposed in the inner barrel, the bottom end of the secondary
piston rod is connected with the secondary piston, the secondary guiding sleeve is mounted inside the top end of the inner barrel, the secondary piston rod penetrates through the secondary guiding sleeve, the top end and the bottom end of the cylinder barrel are respectively provided with a first oil inlet and a second oil inlet, a first oil channel is arranged between the cylinder barrel and the outer barrel, a second oil channel is arranged between the inner barrel and the outer barrel, an external oil inlet is arranged at the bottom end of the outer barrel, an internal oil inlet is arranged at the top end of the inner barrel, a third oil channel is arranged between the secondary piston rod and the inner barrel, and the first oil inlet is successively communicated with the first oil channel, the external oil inlet, the second oil channel, the internal oil inlet and the third oil channel.