The invention discloses a supporting positioning mechanism for a teaching telescope. The supporting positioning mechanism comprises a tripod, wherein a top portion of the tripod is equipped with a mounting sleeve, the mounting sleeve is internally inserted with a supporting rod, a left side of the mounting sleeve is equipped with a rocking rod, a right side of the mounting sleeve is equipped witha fixing rod, a top portion of the supporting rod is fixedly equipped with a disc, an upper surface of the disc is provided with a groove, the groove is internally and movably equipped with a truncated cone, a top portion of the truncated cone is fixedly connected with a vertical rod, a top portion of the vertical rod is equipped with a mirror seat, the mirror seat is equipped with a mirror sleeveseat through a shaft rod, a left lower side of the mirror seat is provided with male tabs, and a bottom surface of the mirror sleeve seat is uniformly provided with multiple cross slits. The supporting positioning mechanism is advantaged in that the supporting rod is controlled through utilizing the rocking bar to move up and down, height of the teaching telescope is convenient to adjust, the male tabs are inserted into the cross slits of the mirror sleeve seat to realize angle fixing of a lens barrel in the vertical plane, observation is more accurate, through cooperation of an arc groove and the special rotation structure of the mirror sleeve seat, the rotation angle of the teaching telescope is enhanced.