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. <EOS>