The invention discloses a temperature-control solidification method for Ti55 cast high-temperature titanium alloy. The method comprises the steps that a mould shell is heated in vacuum to 600-950 DEG C, the temperature is kept constant for 1-2 h, then, pouring is carried out, the metal liquid cooling speed is controlled in the solidification process, heat preservation is kept for 15-60 min at 500-900 DEG C, furnace cooling is carried out, and therefore the purpose of eliminating cracks in a casting process is achieved. Meanwhile, the obtained casting is better in surface smoothness, the mold filling performance and structure compactness of the titanium alloy casting are improved, and the cracking and deformation problems in the casting process are effectively eliminated.