A bypass valve having an EGR valve, comprising: an intake port formed in a side surface of a valve housing; a first exhaust port formed in another side surface of the valve housing and connected to a cooling flow channel of an EGR cooler; a second exhaust port formed adjacent to the first exhaust port and connected to a bypass flow channel of the EGR cooler; a gas transfer channel formed in the valve housing and having a junction section formed in the middle thereof so as to connect the intake port to the first and second exhaust ports (152, 154); an EGR valve coupling section formed in the top surface of the valve housing close to the intake port; the EGR valve coupled to the EGR valve coupling section and partially located at a position of the gas transfer channel close to the intake port so as to pass or intercept exhaust gas; and a flap swingably disposed in the junction section so as to selectively open and close the first and second exhaust ports (152, 154), wherein the junction section is a prism-like space surrounded with three inner walls, an intake hole connected to the intake port is formed in one of the three inner walls, first and second exhaust holes (166b, 166c) connected to the first and second exhaust ports (152, 154), respectively, are formed in the other two inner walls, and the first and second exhaust holes (166b, 166c) are selectively opened and closed by the flap, wherein the angle formed by the two inner walls having the first and second exhaust holes (166b, 166c) is in the range of 60° to 70°, wherein a coolant transfer channel is formed along the circumference of the EGR valve coupling section, an inlet of the coolant transfer channel is connected to a coolant outlet of the EGR cooler, and the outlet of the coolant transfer channel is connected to a radiator, wherein an auxiliary transfer channel connected to the intake hole is formed in the inner wall close to the intake port of the gas transfer channel into which a part of the EGR valve is inserted. an intake port formed in a side surface of a valve housing; a first exhaust port formed in another side surface of the valve housing and connected to a cooling flow channel of an EGR cooler; a second exhaust port formed adjacent to the first exhaust port and connected to a bypass flow channel of the EGR cooler; a gas transfer channel formed in the valve housing and having a junction section formed in the middle thereof so as to connect the intake port to the first and second exhaust ports (152, 154); an EGR valve coupling section formed in the top surface of the valve housing close to the intake port; the EGR valve coupled to the EGR valve coupling section and partially located at a position of the gas transfer channel close to the intake port so as to pass or intercept exhaust gas; and a flap swingably disposed in the junction section so as to selectively open and close the first and second exhaust ports (152, 154), wherein the junction section is a prism-like space surrounded with three inner walls, an intake hole connected to the intake port is formed in one of the three inner walls, first and second exhaust holes (166b, 166c) connected to the first and second exhaust ports (152, 154), respectively, are formed in the other two inner walls, and the first and second exhaust holes (166b, 166c) are selectively opened and closed by the flap, wherein the angle formed by the two inner walls having the first and second exhaust holes (166b, 166c) is in the range of 60° to 70°, wherein a coolant transfer channel is formed along the circumference of the EGR valve coupling section, an inlet of the coolant transfer channel is connected to a coolant outlet of the EGR cooler, and the outlet of the coolant transfer channel is connected to a radiator, wherein an auxiliary transfer channel connected to the intake hole is formed in the inner wall close to the intake port of the gas transfer channel into which a part of the EGR valve is inserted.