The invention discloses a eutectic welding technology and a cooling box for achieving a cooling technology of the eutectic welding technology, and relates to the field of chip processing technologies.According to the eutectic welding technology, the stability is good, the logic is clear, the processing efficiency is high, the chip disengagement problem is effectively solved after the eutectic welding technology is applied, accordingly, the rejection rate is substantially decreased, and the product quality is greatly improved. The eutectic welding technology is used for welding a chip to a frame, and both the chip and the frame unidirectionally move on a rail. The eutectic welding technology comprises a preheating technology, a heating technology, a reflux technology and the cooling technology. The rail is composed of a preheating section, a heating section, a reflux section and a cooling section. The cooling technology is used for enabling the frame and the chip to move on the coolingsection at a constant speed. The cooling section is uniformly divided into a first cooling section body, a second cooling section body, a third cooling section body and a fourth cooling section bodyin the material moving direction, cooling gases of which the temperature is lowered in sequence are injected into the lower portions of the first cooling section body, the second cooling section bodyand the third cooling section body, and the fourth cooling section body is located in a room temperature environment. Through the eutectic welding technology and a cooling box, the rejection rate is substantially decreased, and the product quality is improved.