A polyolefin resin satisfying all the following requirements to : being polymerized in the presence of metallocene compounds represented by following formulas 1 to 4 as catalysts, [Formula 1] (L 1 )(L 2 )(X 1 )(X 2 )M 1 [Formula 2] (L 3 )(L 4 )(X 3 )(X 4 )M 2 [Formula 3] (L 5 -Q 1 n -L 6 )(X 5 )(X 6 )M 3 [Formula 4] (L 7 -Q 2 n -L 8 )(X 7 )(X 8 )M 4 wherein, M 1 , M 2 , M 3 and M 4 each is independently titanium (Ti), zirconium (Zr), or hafnium (Hf), L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 and L 8 each is independently a cyclic hydrocarbyl group having 5 to 30 carbon atoms and having at least two conjugated double bonds, and X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 each is independently a halogen atom or a hydrocarbyl group, Q 1 and Q 2 each is independently a silane group or a hydrocarbyl group containing a substituent, and n is an integer of 1 to 5; having a matrix index of 2 or less and a melt strength of 4.0 Force (cN) or greater measured at 190 °C, wherein the matrix index is calculated according to the following equation 1; Matrix Index = A + B − C / C wherein A is the height of a peak having the lowest molecular weight in the molecular weight distribution graph measured by gel permeation chromatography; B is the height of a peak having the highest molecular weight; and C is the height of the deepest valley between the two peaks, wherein the matrix index approaches 1 as the medium molecular weight fills up between the bimodal molecular weights; having a melt flow index (MIP, 190 °C, 5.0 kg load condition) of 0.01 to 5.0 g/10min; having a ratio (Mw/Mn, MWD) of weight average molecular weight (Mw) to number average molecular weight (Mn) in the range from 5 to 35 as measured by gel permeation chromatography; and having bimodal or multimodal molecular weight distribution measured by gel permeation chromatography, wherein the height ratio of two peaks (the ratio of the height of low molecular weight peak to the height of high molecular weight peak) is 1 to 2. being polymerized in the presence of metallocene compounds represented by following formulas 1 to 4 as catalysts, [Formula 1] (L 1 )(L 2 )(X 1 )(X 2 )M 1 [Formula 2] (L 3 )(L 4 )(X 3 )(X 4 )M 2 [Formula 3] (L 5 -Q 1 n -L 6 )(X 5 )(X 6 )M 3 [Formula 4] (L 7 -Q 2 n -L 8 )(X 7 )(X 8 )M 4 wherein, M 1 , M 2 , M 3 and M 4 each is independently titanium (Ti), zirconium (Zr), or hafnium (Hf), L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 and L 8 each is independently a cyclic hydrocarbyl group having 5 to 30 carbon atoms and having at least two conjugated double bonds, and X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 each is independently a halogen atom or a hydrocarbyl group, Q 1 and Q 2 each is independently a silane group or a hydrocarbyl group containing a substituent, and n is an integer of 1 to 5; having a matrix index of 2 or less and a melt strength of 4.0 Force (cN) or greater measured at 190 °C, wherein the matrix index is calculated according to the following equation 1; Matrix Index = A + B − C / C wherein A is the height of a peak having the lowest molecular weight in the molecular weight distribution graph measured by gel permeation chromatography; B is the height of a peak having the highest molecular weight; and C is the height of the deepest valley between the two peaks, wherein the matrix index approaches 1 as the medium molecular weight fills up between the bimodal molecular weights; having a melt flow index (MIP, 190 °C, 5.0 kg load condition) of 0.01 to 5.0 g/10min; having a ratio (Mw/Mn, MWD) of weight average molecular weight (Mw) to number average molecular weight (Mn) in the range from 5 to 35 as measured by gel permeation chromatography; and having bimodal or multimodal molecular weight distribution measured by gel permeation chromatography, wherein the height ratio of two peaks (the ratio of the height of low molecular weight peak to the height of high molecular weight peak) is 1 to 2. <EOS>