A heat pump system for a vehicle is provided. The system includes an engine cooling device having a first radiator and a first water pump connected via a first coolant line. An electrical equipment cooling device includes a second radiator and a second water pump connected via a second coolant line. A battery module is disposed in a battery coolant line selectively connected with the second coolant line. An air conditioner is connected with the battery coolant line and includes a third water pump and a cooler disposed in the first connection line. A heating device is connected with the first coolant line via a third valve and includes a fourth water pump and a heater disposed in the second connection line. A centralized energy (CE) module supplies a coolant to the air conditioner, is connected with the coolant lines to supply a high-temperature coolant to the heating device.