The invention provides a method for controlling volatilization of an Al element by adjusting the vacuum degree of an electron beam cold bed furnace. The method comprises the following steps that a servo motor, a frequency converter, a controller and a vacuum degree detection device are additionally arranged on the conventional electron beam cold bed furnace, a vacuum degree allowable range, a rough adjustment step value V, a fine adjustment step value v and time t are set on the controller; real-time control over the rotating speed of a vacuum pump driving motor is achieved by adopting a powerfrequency converter and vacuum degree real-time feedback, so that the fact that the vacuum degree in the furnace is kept stable is realized, and then the purpose of stabilizing the volatilization rate of the Al element is achieved. According to the method for controlling volatilization of the Al element by adjusting the vacuum degree of the electron beam cold bed furnace, the volatilization rateof the Al element during titanium alloy smelting can be stabilized, the component uniformity of the low-melting-point metal, especially the Al element, in the titanium alloy ingot is improved, an obtained titanium alloy product is small in component segregation, uniform in structure and high in performance stability; and the volatilization amount of the Al element during titanium alloy smelting can be reduced, and the metal loss and energy consumption are reduced.
