The invention discloses an iron-removal method for a solution and a preparation method of an iron-based adsorption material. The preparation method comprises the following steps: adding a carrier withan adsorption function into a ferrous ion-containing solution, introducing air/oxygen with a certain flow rate, taking a metal oxide MeO or a metal carbonate MeCO3 as a neutralizer to carry out a high-shear oxidation iron-removal reaction under a condition with a certain temperature and pH value, carrying out a further modification reaction on the precipitated iron product obtained by liquid-solid separation in an acid solution for a certain time after the reaction is finished, and then carrying out washing and drying to obtain the iron-based adsorption material with good performance. According to the scheme provided by the invention, efficient iron removal of a solution can be realized, and the obtained iron removal product can be directly prepared into the iron-based adsorption materialwith good performance, so that high-value utilization of iron resources is realized.