The invention discloses a screw type water chilling unit and relates to the field of refrigeration equipment. The screw type water chilling unit is used for improving the installation flexibility of a water chilling unit and comprises an evaporator and a condenser. The evaporator comprises a first open part and a second open part. The condenser comprises a cavity body, a first sealing piece and a second sealing piece, wherein the first sealing piece and the second sealing piece are arranged at the two ends of the cavity body. One of the first sealing piece and the second sealing piece is provided with a water inlet pipe and a water outlet pipe at the same time. The evaporator is provided with a fluid parameter detection element used for detecting parameters of the same kind of fluid in the first open part and the second open part, any one of the first open part and the second open part can serve as a fluid inlet, and the other one serves as a fluid outlet. And/or, the condenser is arranged in the mode that installation positions of the first sealing piece and the second sealing piece can be exchanged. Through the technical scheme, the fluid inlet and the fluid outlet of the evaporator can be selected at will, the positions of the water inlet pipe and the water outlet pipe of the condenser can be changed, and the installation flexibility of the unit is improved.