The invention discloses a roller adjusting mechanism of a small standard copper belt rolling machine, comprising an installation plate, a worm, a worm sleeve, a hand wheel, a nut, bevel gears I and II, synchronous pulleys I and II, a reduction motor and an electromagnetic clutch, wherein the installation plate is fixed on a rack provided with a roller to be adjusted in a support mode, the worm is arranged on the installation plate provided with screw shafts I and II, the bevel gear I is fixed on the screw shaft I and is meshed with the worm, the bevel gear II is fixed on the screw shaft II, the worm sleeve is sheathed at the worm and is meshed with the bevel gear II, the hand wheel is fixed at the outer end of the worm sleeve, the nut is arranged at one end of the worm, the synchronous pulley I is sheathed at the other end of the worm, the electromagnetic clutch is positioned at the outer end surface of the synchronous pulley I, the synchronous pulley II is arranged at the reduction motor, and the synchronous pulleys I and II are connected by a synchronous belt. According to the roller adjusting mechanism of the small standard copper belt rolling machine, adjustment on the small standard copper belt rolling machine is realized, the adjusting is simple, the labor intensity is low and the production efficiency is high.