The invention discloses a tedious calculation omitted angle corrector for a stereo positioning instrument. The left end and the right end of a base are respectively and fixedly provided with a side plate, a lug rod inserting hole is formed in the upper portion of each side plate, and a transverse dovetail guide rail which is fixedly mounted on the base is arranged between the side plates at the two ends. The transverse dovetail guide rail is provided with a transverse movement sliding block, the transverse movement sliding block is provided with a longitudinal dovetail groove, and a longitudinal movement sliding block which can move longitudinally is arranged in the longitudinal dovetail groove. The longitudinal movement sliding block is fixedly provided with a three-dimensional space positioning pillar, a three-dimensional space positioning tip is arranged at the top end of the three-dimensional space positioning pillar, the three-dimensional space positioning pillar is sleeved with a rotatable three-dimensional space positioning pillar sleeve, and an altitude scale is arranged at the top end of the three-dimensional space positioning pillar sleeve. A toothed plate contact element is arranged at the end of the outer side of the base. The tedious calculation omitted angle corrector for the stereo positioning instrument is reasonable in structure, can be used in various models of brain stereo positioning instruments and can help people achieve omnibearing any-angle inserting of an electrode at the position over the insertion part of the electrode under the condition that large blood vessels or blood vessel sinuses exist.