The invention provides an environment-friendly water purification bag for water treatment and a preparation method of the bag. The environment-friendly water purification bag comprises a water purification material packing bag and a water purification material which is arranged in the water purification material packing bag; the water purification material packing bag is made of bamboo charcoal fiber; the water purification material comprises, by weight, 25-30 parts of palygorskite, 20-25 parts of diatomite, 10-15 parts of bentonite, 10-20 parts of vermiculite, 15-20 parts of modified loofah fiber, 5-8 parts of bamboo sawdust and 8-10 parts of charcoal powder. The raw components of the water purification material can be well compounded so that the components of the prepared water purification material can cooperate with each other and play a role, and the aim of synergistic interaction is achieved; the environment-friendly water purification bag can adapt to the treatment demands of different types of water, can efficiently remove pollutants in the water and achieves a good water purification effect; meanwhile, the water purification material packing bag body which is made of the bamboo charcoal fiber also has super high adsorption capacity and can cooperate and work with the water purification material in the bag body to remove the pollutants in the water.