The invention discloses a a control method for producing a trivalent chromium passivated steel coil. The method comprises the following steps of: cleaning and changing liquid of a working groove in roller coating equipment firstly; evacuating the passivation solution in the working groove to a working tank in the roller coating equipment; and then obtaining the temperature of a combustion chamber,controlling the temperature of the combustion chamber at 270-500 DEG C, and heating the passivated steel coil; finally, directly coating and passivating the heated steel coil to be passivated by thepassivation liquid in the working tank based on the established correspondence table. The control method provided by the invention solves the technical problems of improper use of parameters and unstable control in the prior art, realizes the passivation quality ensuring the product, so the corrosion resistance and appearance quality on the surface of the strip steel are ensured; the control method is beneficial to the long-term use and maintenance of the equipment body; and the technical effect of reducing personnel and equipment costs is realized.