A new type sorbent with multi wall carbon nanotube （MWCNT） and polyurethane vesicant was prepared, which can be used to adsorb humic acid（HA） in natural water. The pH value of HA solution, the initial concentration of HA, and the dosage of MWCNT--polyurethane foam how to affect the adsorbing process and efficiency for HA were investigated by a seris of experiments. The experimental result shows that adsorption equilibrium time was about 5 h for adsorbing HA, 1% CNT polyurethane foam had very high adsorbing efficiency at acidic condition（the pH value at 3.5 and 5.5）, the adsorbing ef- ficiency were 100% and great than 80% respectively when HA beginning concentration less than 20 mg/L and at range of 20-40 mg/L. The MWCNT-polyurethane foam was a new and high efficiency sorbent, it had very high adsorbing efficiency for HA in natural water at acidic condition. The pattern of MWCNT--polyurethane foam absorbing HA fits well with Langmuir formula.