This paper aims to develop and standardize the emotional maturity of high school teachers scale. Emotional maturity is a process in which the personality is continuously striving for greater sense of emotional health, both intra-physically and intra-personally. If teachers are emotionally mature which means if they have the ability to realize the psychological knowledge and utilize it, they will be able to help students at right time by checking their problems as they start advancing. Teachers should teach children to develop emotional maturity, but in order to do this they must have a similar characteristic in themselves. The steps followed for its construction and standardization are (i) Ensuring purpose and usefulness of items, (ii) Structuring the tool, (iii) Pilot study and item analysis, (iv) Validity, (v) Reliability, (vi) Final draft of the tool. The researcher developed the preliminary version of AVSEM Scale (104 items) with simple, clear, and concise statements for better understanding both in Tamil and English versions. The validity for each item was tested. Thus the final AVSEM Scale consists of 60 items. This scale was aimed at covering the knowledge and conceptions of high school teachers about the emotional maturity. This tool will help to the Emotional Maturity of high school teachers.