The invention discloses a simulated testing apparatus for a circulating pipeline and a TiCl4-vanadium-removing pipeline blockage condition testing method. Production of a circulating pipeline is simulated to optimize a production process. Te testing apparatus comprises a storage tank and a circulating pump; a loading hopper is arranged on the storage tank; the inlet end of the circulating pump is arranged in the storage tank and the outlet end of the circulating pump is connected with a pipeline connected to the storage tank to form a circulating loop; and a flow testing unit, a pressure testing unit, a viscosity testing unit, and a temperature testing unit are arranged on the circulating loop. A basis is provided for production process optimization by simulating a similar production process. In addition, the testing method based on the apparatus is characterized in that coarse titanium tetrachloride is placed in the storage tank, heating is carried out and the coarse titanium tetrachloride circulates in the storage tank and the pipeline; a vanadium-removing reagent is added; the operation of a heat exchanger in the titanium tetrachloride purification process is simulated; and thus the testing researches on vanadium-removing residues obtained by using different vanadium-removing reagents as well as effects on the heat exchanger by vanadium-removing residues with different concentrations are developed.