The disclosure relates to a method and system for monitoring abnormality in glass substrate forming. The method comprises: temperatures of a plurality of preset positions are obtained, wherein some preset positions are distributed at a target convex side of a glass substrate and the rest preset positions are distributed at a target concave side of the glass substrate; according to the temperaturesof the preset positions distributed at the target convex side of the glass substrate, the temperature of the target convex surface side of the glass substrate is determined, and according to the temperatures of the preset positions distributed at the target concave side of the glass substrate, the temperature of the target concave surface side of the glass substrate is determined; on the basis ofthe temperature of the target convex side and the temperature of the target concave side, whether nay forming abnormality occurs at the glass substrate is determined; and if so, alarming is carried out. Therefore, real-time monitoring of the glass substrate forming is realized; alarming is carried out when forming abnormality occurs at the glass substrate and thus the relevant staff is warned totake remedial measures timely, so that the product scrap rate is reduced and the yield is increased.