The invention discloses a heat source tower solution concentration device based on screw compressor lubricating oil. The heat source tower solution concentration device based on the screw compressor lubricating oil comprises a sealed container, wherein an isolation plate is arranged in the sealed container; a finned tube heat exchanger is arranged on one side of the isolation plate, and the other side of the isolation plate is a solution side; the bottom of the finned tube heat exchanger is connected with a solution in a heat source tower through a first valve, and the top of the finned tube heat exchanger is connected with the first inlet end of a heat exchanger through a water pump A; a liquid divider connected with the first outlet end of the heat exchanger is arranged on the solution side of the sealed container; the bottom of the solution side is connected with a heat pump system of the heat source tower through a second valve and a water pump C; the second inlet end of the heat exchanger is connected with lubricating oil of a screw compressor so as to heat the solution in the heat source tower; the temperature of the lubricating oil is higher than that of the solution in the heat source tower; therefore, the heat required for concentration of the solution in the heat source tower is greatly reduced, and the energy consumption is reduced.