Work environments are pivotal to teachers' professional development. However, effective instruments assessing teachers' perceived work context are still lacking. The principal aim of the present study was to validate a Work Environments Inventory for Teachers (WEIT) constructed using the Job Demands-Resources (JD-R) model. Two studies were implemented on two independent samples totaling 696 (232 for Study 1 and 464 for Study 2) schoolteachers in Mainland China. Both exploratory and confirmatory factor analyses were employed to cross-validate the WEIT. The external construct validity of the WEIT was estimated through investigating its connection with the Thinking Styles in Teaching Inventory. Findings indicated that the WEIT is an adequate measure to map the characteristics of work environments for schoolteachers. Limitations are discussed and implications for future studies are suggested.