Manufacturing method of solid catalyst for propylene polymerization

A method for preparing a solid catalyst comprising the following steps:

• (1) reacting dialkoxymagnesium and a titanium halide, in the presence of an organic solvent;
• (2) adding an internal electron donor selected from the compounds represented by the following formula (II) together with another internal electron donor selected from the compounds represented by the following formula (IV) to the resulted product from the above step (1), and mixing them together, while elevating the temperature to the range of 80-130° C.,
• wherein, R1, R2, R3 and R4 are independently a linear, branched or cyclic C1-10 alkyl group or hydrogen;
• wherein, R1, R2 and R4 are independently a linear, branched or cyclic C1-10 alkyl group or hydrogen;
• R3 is a linear, branched or cyclic C1-10 alkyl group;
• and
• (3) reacting titanium halide with the resulted product from the above step (2) at the temperature range of 80-130° C. and washing the resulted product.