Isothermal precision hot forming method for super-thick titanium alloy large shell part

The invention discloses an isothermal precision hot forming method for a super-thick titanium alloy large shell part. The isothermal precision hot forming method comprises the steps that the preset forming temperature, the preset heat preservation and heating time and the preset heat preservation and pressure maintaining time are obtained; mounting the forming die on an isothermal hot forming machine; a to-be-formed workpiece is placed on the forming die, and the to-be-formed workpiece is a super-thick titanium alloy plate; the isothermal hot forming machine heats the forming die and the to-be-formed workpiece to a preset forming temperature, the forming die and the to-be-formed workpiece are subjected to heat preservation according to preset heat preservation heating time, the to-be-formed workpiece is pressed, and a formed workpiece is obtained; the formed workpiece is subjected to heat preservation and pressure maintaining according to preset heat preservation and pressure maintaining time; and opening the