Leader anger is one of the most common and perceived workplace negative emotions, which has a significant impact on improving work relationships, behavior and performance. Nonetheless, there is an important controversy on whether leader anger in the workplace leads to negative work outcomes or the possible positive implications across different contexts, that is, hinders or promotes leadership effectiveness. It is still unclear why and how leader anger affects leadership effectiveness. We aim at adding to this literature by addressing important issues such as concept, positive and negative effectiveness, two-path mechanisms, boundary conditions under which anger expression in the workplace will lead to specific positive or negative outcomes. We finally proposed future prospects from its concept, structure and measurement, event antecedents and outcomes, mediating mechanisms, context factors, research method and levels, leaving us much space for the follow-up.