Pre-concentration and determination of 7 phenolic compounds in water samples has been achieved using a new liquid-liquid microextraction coupled HPLC-DAD. Microextraction efficiency factors have been investigated and optimized: 14 µL 1-undecanol micro drop exposed for 15 min floated on surface of a 20 mL water sample at 55°C, stirred at 1200 rpm, low pH level and saturated salt conditions. Under the selected conditions, limit of detection of 0.5- 3.0 µg L-1 (S/N=3) and linearity range of 0.3-870 µg L-1 have been obtained. A reasonable repeatability (RSD ≤ 10.1%, n=5) with satisfactory linearity (0.9992 ≥ r2 ≥ 0.9973) of results illustrated a good performance of the present method. The relative recovery of different natural water samples was higher than 84%.