Nutrient slow-release type drinking water purifier and preparation method

The invention provides a preparation method for a nutrient slow-release type drinking water purifier. The method comprises the steps: smashing palygorskite clay raw ore and dispersing into citric acid solution, stirring for 12-24 hours, filtering, drying, crushing, adding a plus hole agent, an antibacterial agent and nutrient elements, selenium and zinc, grinding for 0.2-0.5 hour in a high-speed ball mill, granulating in a granulator, rolling into a rotary kiln, and calcining for 0.5-1 hour at 400-500 DEG C to obtain the nutrient slow-release type drinking water purifier. Experiments show that after being treated by the nutrient slow-release type drinking water purifier, the drinking water has the pH value of 7.35-7.45, the potassium ion content is between 0.4 mg/L-0.55 mg/L stably, the zinc ion content is between 0.1 mg/L-0.25 mg/L stably, the iodine content is between 0.02 mg/L-0.1 mg/L stably, the selenium content is between 0.002-0.005 mg/L stably, and water becomes nutritional weak alkaline water, is in full compliance with national GBGB5749-2006 drinking water quality requirements, and also accords with national health drinking water quality standards.