Cold water machine varying load system

The utility model provides a cold water machine varying load system used for simulating cold water machine system bearing load. The system comprises a water tank and a varying load pipeline which is connected to the water tank. The varying load pipeline and a heat exchanger of a cold water machine system form heat exchange connection. A pipe branch is connected between an input pipeline and an output pipeline of the varying load pipeline. The input pipeline and the pipe branch are connected through a three-way control valve. A part of a cooling liquid carries out shunting via the pipe branch, flows into the input pipeline and cools a liquid which flows out of the water tank. Through arranging the three-way control valve, a flow direction and a quantity of flow of the cooled liquid in the varying load pipeline are adjusted so that the varying load pipeline can simulate different temperature environments. A cooling capacity generated by the cold water machine is used to carry out heat blending in the varying lo