A cooling system for an eco-friendly vehicle, comprising: an electronic component cooling device including an electric component and configured to cool the electronic component of an eco-friendly vehicle; a battery cooling device including a battery to supply energy for driving the vehicle and configured to cool the battery installed within the eco-friendly vehicle; a connector that connects the electronic component cooling device and the battery cooling device; the electronic component cooling device further including: a heat exchanger configured to cool a coolant flowing in the electronic component cooling device; a first pump configured to circulate the coolant in the electronic component cooling device; and a reservoir tank into which the coolant is injected and in which the coolant is stored; an electronic component cooling pipe that connects the heat exchanger, the first pump, and the reservoir tank and through which the coolant flows; characterized in that wherein the battery cooling device includes: a second pump configured to supply a coolant injected into the reservoir tank to the battery cooling device; a jiggle valve connected to the reservoir tank, disposed in front of an inlet of the battery, configured to block introduction of air into the battery, and to discharge the air to the reservoir tank; a battery cooling pipe that connects the second pump, the battery, and the jiggle valve, and through which the coolant flows; and a chiller disposed in upstream of the battery and configured to cool a coolant of the battery cooling pipe. an electronic component cooling device including an electric component and configured to cool the electronic component of an eco-friendly vehicle; a battery cooling device including a battery to supply energy for driving the vehicle and configured to cool the battery installed within the eco-friendly vehicle; a connector that connects the electronic component cooling device and the battery cooling device; the electronic component cooling device further including: a heat exchanger configured to cool a coolant flowing in the electronic component cooling device; a first pump configured to circulate the coolant in the electronic component cooling device; and a reservoir tank into which the coolant is injected and in which the coolant is stored; a heat exchanger configured to cool a coolant flowing in the electronic component cooling device; a first pump configured to circulate the coolant in the electronic component cooling device; and a reservoir tank into which the coolant is injected and in which the coolant is stored; an electronic component cooling pipe that connects the heat exchanger, the first pump, and the reservoir tank and through which the coolant flows; characterized in that wherein the battery cooling device includes: a second pump configured to supply a coolant injected into the reservoir tank to the battery cooling device; a jiggle valve connected to the reservoir tank, disposed in front of an inlet of the battery, configured to block introduction of air into the battery, and to discharge the air to the reservoir tank; a battery cooling pipe that connects the second pump, the battery, and the jiggle valve, and through which the coolant flows; and a chiller disposed in upstream of the battery and configured to cool a coolant of the battery cooling pipe. a second pump configured to supply a coolant injected into the reservoir tank to the battery cooling device; a jiggle valve connected to the reservoir tank, disposed in front of an inlet of the battery, configured to block introduction of air into the battery, and to discharge the air to the reservoir tank; a battery cooling pipe that connects the second pump, the battery, and the jiggle valve, and through which the coolant flows; and a chiller disposed in upstream of the battery and configured to cool a coolant of the battery cooling pipe.