PURPOSE: A cosmetic pack composition is provided to remove contaminated heavy metal and skin dead cell and to ensure moisturization. CONSTITUTION: A pack composition containing brown algae powder contains 1-12 weight% of brown algae powder, 1-3 weight% of ascorbic acid, and remaining amount of pack base. The brown algae powder is prepared from brown algae or brown algae extract. The composition further contains 1-9 weight% of herb powder and 0.1-6 weight% of Arabic gum. The pack base contains 5.1-16.5 weight% of glycerin, 1-9.5 weight% of starch, 1-2.4 weight% of sodium dodecylsulfate, 1-9.4 weight% of titanium oxide(TiO_2), 46-94 weight% of purified water, 0.2-4.7 weight% of ethanol, 0.2-0.5 weight% of pigment, 0.1-0.4 weight% of methyl paraben, and 0.1-0.4 weight% of phenoxy ethanol.본 발명은 화장품용 팩 조성물에 관한 것으로, 보다 구체적으로는 갈조류분말을 포함하여 갈조류에 포함된 생리활성 물질에 의해 각질제거, 보습 등에 우수한 효과가 있는 갈조류분말 함유 팩 조성물 및 상기 조성물을 포함하는 화장용 팩제품에 관한 것이다.