The invention discloses a carrier type chromium-series catalyst, a preparation method and the application of the chromium-series catalyst to vinyl polymerization. The preparation method comprises the following steps of: reacting a dialkyl magnesium compound with an alcohol compound to form solution of magnesium compound, loading the solution of magnesium compound on dried carrier silica gel and calcining a product in nitrogen at the temperature of between 100 and 400 DEG C; and switching the nitrogen to air, raising the temperature to 550 to 850 DEG C, calcining and activating so as to obtain a final catalyst. When applied to vinyl polymerization, the chromium catalyst remarkably reduces ignition time, quickly raises polymerization activity and can obtain higher polymerization efficiency within the same residence time.