The invention provides a high-voltage precise resistance divider and a preparation method thereof. The invention discloses a high-voltage precise resistance divider and a preparation method thereof, belonging to the field of high-voltage precise resistance divider. The invention relates to the high-voltage precise resistance divider, which mainly comprises a ceramic tube 1, a patterned resistance film, an electrode 2, an electrode (partial pressure signal output terminal) 3, and lead-out terminals 13. The preparation method comprises the following steps: 1. patterns of a spiral belt resistance film 4 and unequal line group resistance film 5 are designed on the same net plate, are roll-printed on the surface of the same ceramic tube by the same material and are then sintered to films at the same temperature simultaneously; 2. the main pattern of the spiral belt resistance film 4 is an isometric helix; the pattern of the unequal line group resistance film 5 is an unequal line group; and the resistance adjustment adopts a sudden-type resistance-adjusting point with the adjustment amount designed in advance; 3. after the resistance of the resistance ceramic tube is adjusted, the medium slurry is roll-printed on the surface thereof and the ceramic tube is sintered as a voltage divider resistance core; and 4. lead-out terminals 13 are installed at two ends of the voltage divider resistance core, thus preparing the high-voltage precise resistance divider.