The invention discloses an ultrasonic vibration heat balance method semisolid pulping production line and technology. An ultrasonic vibrator is selected to be combined with a heat balance method treating device, a hollow heat absorption pipe is used as a vibration source, ultrasonic vibration is applied during heat absorption of the heat absorption pipe, the heat balance method and ultrasonic vibration are compounded to act in a melt solidification process, the temperature field of pulp is homogenized through the heat absorption circular pipe and the crystal breaking effect, acoustic streamingeffect and mechanical effect of ultrasonic waves, harmful gas and impurities are removed, homogeneity of the pulp structure is ensured, the gold phase structure of alloy pulp is more effectively improved, and therefore fine semisolid pulp of the approximate spherical microstructure is obtained. The production process is reasonably arranged, full-automatic production control over semisolid machining is achieved, and safety, stability and accuracy of the machining process are improved; the advantages and characteristics of the semisolid forming technology are brought into full play, the technology industrialization process can be accelerated, and a good foundation is laid for achieving industrial application.