The invention discloses haematococcaceae effervescent tablets capable of clearing heat and relieving summer-heat and a preparation method thereof. The haematococcaceae effervescent tablets are prepared from the following raw materials: haematococcus pluvialis powder, water chestnut flour, coconut meat, pear juice, perilla leaves, sargassum fusiforme, cordyceps flowers, green tea powder, tomato powder, American ginseng and the like. The haematococcaceae effervescent tablets have the beneficial effects that the haematococcus pluvialis powder of the haematococcaceae effervescent tablets is rich in astaxanthin with strong oxidation resistance, so that the haematococcus pluvialis powder is a good therapeutic and healthcare component; the haematococcaceae effervescent tablets which are convenient to mix with water are prepared by combining the haematococcus pluvialis powder with the water chestnut flour, the coconut meat, the pear juice and the like which have the characteristics of cooling and refreshing; the prepared haematococcaceae effervescent tablets have not only good taste and good flavor, but also the therapeutic and healthcare effects of clearing heat, relieving summer-heat, nourishing yin, moistening dryness, resisting oxidation, moisturizing and caring skin.