The present invention relates to a method for preparing a solid catalyst for ethylene polymerization and/or copolymerization. More specifically, the present invention relates to a solid titanium catalyst supported in a magnesium support which has an extremely high catalytic activity, advantageous catalyst shape and a simple preparation process, capable of producing a polymer with a high bulk density, a narrow and uniform particle size distribution and a broad molecular weight distribution, and a method for preparation of the same. A silicon-containing magnesium compound is prepared by reacting an electron donor such as a silicon compound containing an alkoxy group of Formula 1, a silicon compound containing an alkoxy group of Formula 2, or a mixture thereof in a magnesium compound solution, and reacted with a titanium compound to obtain the solid catalyst of the present invention. Si(R1)(R2)(OR3)2  [Formula 1] wherein R1 is trimethylsilylmethyl or 2-phenylpropyl; R2 is linear, cyclic or branched alkyl of C3-C6 such as 1-hexyl, cyclohexyl, cyclopentyl, n-butyl, iso-butyl or propyl; and R3 is alkyl of C1-C3. R1aR2bSi(OR3)4−(a+b)  [Formula 2] wherein R1 and R2 are individually hydrocarbon of C1-C12; R3 is hydrocarbon of C1-C5; and a=0 or 1, b=0 or 1.