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(R.sup.1)(R.sup.2)(OR.sup.3).sub.2 [Formula 1] wherein R.sup.1 is trimethylsilylmethyl or 2-phenylpropyl; R.sup.2 is linear, cyclic or branched alkyl of C.sub.3-C.sub.6 such as 1-hexyl, cyclohexyl, cyclopentyl, n-butyl, iso-butyl or propyl; and R.sup.3 is alkyl of C.sub.1-C.sub.3. R.sup.1.sub.aR.sup.2.sub.bSi(OR.sup.3).sub.4-(a+b) [Formula 2] wherein R.sup.1 and R.sup.2 are individually hydrocarbon of C.sub.1-C.sub.12; R.sup.3 is hydrocarbon of C.sub.1-C.sub.5; and a=0 or 1, b=0 or 1.