The invention provides an evaporation source, and relates to the technical field of evaporation plating. The evaporation source is used for solving the problem that in the prior art, a mask plate is heated to be deformed due to the fact that heat leaked by the evaporation source is too high. The evaporation source comprises a crucible and heaters used for generating heat radiation; the crucible comprises a crucible body and a nozzle arranged on the top face of the crucible body, and heat adjusting assemblies are arranged on at least one side of the other sides of the crucible body except the top face side of the crucible body; the heat adjusting assemblies are used for enabling heat radiation between the heat adjusting assemblies and the crucible body to generate convection; and gaps are formed between the heat adjusting assemblies and the crucible body.