An evaporative humidifier includes: a main unit;a water tank, where an opening is formed in an upper portion of the water tank, such that the main unit can be placed into the water tank from the opening; and a support structure, where the support structure can be detachably disposed on the upper portion of the water tank to support the main unit exposed out of the water tank, and the support structure can be detachably assembled to an upper portion of the main unit or an outer side of the water tank. The main unit can be received in the water tank. The upper portion of the main unit or the outer side of the water tank is provided with an assembly structure for the support structure, such that the support structure remains assembled together with the main unit or the water tank in a storage state.