Catalyst carrier for olefin polymerization, solid catalyst component and catalyst

A solid catalyst component for olefin polymerization, comprising the reaction products of spherical dialkoxy magnesium carrier, titanium compounds and electron donor compounds in an inert solvent, wherein said dialkoxy magnesium carrier is the product prepared by the reflux reaction of magnesium, mixed alcohols and mixed halogenated agents in an inert atmosphere, in which said mixed halogenated agents are iodine and magnesium chloride, and said electron donor compounds are selected from did ester compounds as shown in Formula (I):

• wherein, R1-R6 and R1-R2n groups, the same with or different from each other, can be hydrogen atom, halogen atom, substituted or unsubstituted straight chain or branched chain C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl, C7-C20 aralkyl, C2-C10 alkenyl, C10-C20 fused ring aryl or ester group;
• R1 and R2 are not hydrogen atoms;
• R3-R6 and R1-R2n groups can optionally comprise one or more heteroatoms as the substituent of carbon and/or hydrogen atom, in which said heteroatoms are selected from nitrogen, oxygen, sulfur, silicon, phosphorus and halogen atoms, and one or more of R3-R6 and R1-R2n groups can optionally form a ring with each other;
• and, n is an integer selected from 0 to 10.