The present invention relates to a composition of a temporary hair thickener. In particular, the present invention relates to a composition of a temporary hair thickener comprising bamboo charcoal powder, a hydrophobic waterproof coating agent, a low grade alcohol and a propellant in a specific amount. The composition of a temporary hair thickener in accordance with the present invention can be attached to hair for a longer time as compared with the prior art hair thickeners, thereby showing improved persistency. Further, since the thickener ingredients of the composition are hardly flowed down or detached from hairs by rain or sweat, the composition of the present invention solves the problem of blotting the skin and clothes.竹炭粉末、疏水性防水皮膜剤、低級アルコール、及び噴射剤を所定量含有することにより、既存の毛髪塗布剤に比べて組成物が毛髪に長時間付着されて持続力を向上させ、塗布剤組成物が毛髪から流れ落ちて皮膚や衣服を汚してしまう問題を改善させた一時毛髪塗布剤組成物を提供する。【選択図】図4