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The increasing use of carbofuran pesticides in agriculture can lead to disruption and decline in environmental quality which is very detrimental to the balance of coral reef ecosystems in coastal area. The purpose of this study was to determine the toxicity of carbofuran pesticides to Acropora sp. and find out the changes in density zooxanthella after 0, 24, 48, and 96 hours. This research was conducted in the waters and the Teluk Awur campus laboratory, Jepara. The method used is the experimental method. The tests carried out were preliminary tests and follow-up tests to determine changes in the density of zooxanthella after 0, 24, 48, and 96 hours. Probit analysis was used to determine the toxic level and toxicity of carbofuran pesticides against coral Acropora sp. The results showed that carbofuran pesticides had a threshold of 10 - 100 ppm against Acropora sp. and has toxic levels of 28.901 ppm against Acropora sp. corals and categorized in moderate lethal toxicity. This study also showed that the higher levels of carbofuran pesticides caused the rapid release of algae symbionts zooxanthella from corals.