It is applicable for earth breaking after cultivation, stubble cleaning before cultivation and “cultivation instead of harrowing” of medium and light soils in dry farmlands. 1BJX-2.0 18-blade medium mounted harrow can be retrofitted to the 1BJX-2.2/2.5 20/24-blade medium mounted harrow in order to improve its matching capacity and agronomic requirements. This machine is featured by simple and solid structure, practical performance, convenient maintenance and good earth breaking performance and penetrability. After cultivation, the earth surface is smooth, which can meet the agricultural technical requirements for intensive cultivation. It is a series product, with high degree of “industrialization, urbanization and modernization” and numerous interchangeable parts, convenient for the users to repair and replace.