Illegitimate tasks are work stressors that refer to tasks in violation of what is reasonably expected from a given person. In recent years, a growing number of studies have focused on illegitimate tasks. However, in general, the academic research on it is still in its infancy, and the existing research is relatively loose, which is not conducive to the accumulation of knowledge and the development of follow-up research. Therefore, this paper systematically reviews the research status and latest progress of illegitimate tasks, including the concept, measurement, antecedents, effects and boundary conditions of illegitimate tasks. And analyzing the deficiencies of existing research and put forward prospects for future research to promote the development of this field.