A rolling mechanism of a transmission shaft in a wood-working machine is disclosed. A power mechanism provides the transmission shaft with a rotational force and is inside a box which is pivoted with a stabilizing rod to position a stabilizing plate. The rolling mechanism includes two plates and a positioning ring. The positioning ring is combined on the transmission shaft and rotates along with the transmission shaft. An outer periphery of the positioning ring is a concaved ring, and outer peripheries of the plates enter into the concaved ring so that the plates are clipped. An inner ring of the positioning ring positions the transmission shaft. By the plates of the stabilizing plate, the positioning ring of the transmission shaft rotates smoothly and is supported stably. The plates are outside the positioning ring and are assembled and dismantled easily.