Method and device for adjusting outlet water temperature of water chilling unit and water chilling unit

The invention relates to the technical field of refrigeration, and discloses a method for adjusting the outlet water temperature of a water chilling unit, which comprises the following steps: detecting the inlet water temperature of a cold water inlet pipeline of a water chiller under the condition that the water chiller of the water chilling unit operates in a parallel state; under the condition that the water inlet temperature is larger than the first temperature threshold value and smaller than the limiting temperature, the water inlet temperature change difference value of the cooling-water machine within the preset duration is obtained; and under the condition that the water inlet temperature change difference value meets a first preset condition, a three-way valve on a cold water outlet pipeline of the water chiller is controlled to be in a first state, so that the water chiller provided with the three-way valve and another water chiller connected through the three-way valve are switched from a parallel