The invention provides a pulverized coal dispersing agent and an active water fracturing fluid for fracturing of a coal bed gas well. The pulverized coal dispersing agent is characterized in that the pulverized coal dispersing agent comprises the following components: (1) a non-ionic surface active agent; (2) organic ammonium salt; and (3) alcohol, wherein the non-ionic surface active agent is octyl phenol polyoxyethylene ether, the organic ammonium salt is 12-alkyl-3-methylammonium chloride, and the alcohol is ethyl alcohol, propyl alcohol, butyl alcohol or amyl alcohol; and the mass ratio of the non-ionic surface active agent, the organic ammonium salt and the alcohol is 2:1:7. The invention can lead the pulverized coal to be uniformly distributed in the fracturing fluid, reduce construction pressure, simultaneously discharge the pulverized coal out of the stratum with the fracturing fluid when discharging the fluid and avoid the blocking of crack channels.