The present invention relates to rice beverage containing high contents of amino acid with precipitate stability and a producing method thereof which comprises a step of pulverizing water soaked rice, and a step of adding agar to the rice powder for preventing the rice powder from precipitating, making the rice power float for a long time, and enabling users to easily drink the beverage. Contents of amino acid of the beverage are improved through the heat-treatment of a mixture, and nutrition of the beverage is improved by adding additional ingredients including edible fibers to the mixture.COPYRIGHT KIPO 2014[Reference numerals] (AA) Start (BB) End (S101) Rice powder manufacturing step (S102) Malt extract manufacturing step (S103) Additional ingredient preparing step (S104) Heat treatment step (S105) Saccharification step (S106) Filtering step (S107) Sweetness process step (S108) Cooling step본 발명은 침전 안정성이 우수한 아미노산 고함유 쌀음료 및 그 제조 방법에 관한 것으로, 본 발명에 의하면 쌀음료 제조간 수침된 쌀을 쌀가루로 분말화하고, 분말화된 쌀가루가 바닥에 가라앉지 않도록 한천을 첨가함으로써 쌀가루가 장시간동안 부유하게 되므로 기존의 쌀음료에 비해 음용이 편리하다.또한, 본 발명은 혼합물을 열처리하는 과정을 통해 아미노산이 향상되고, 식이섬유가 함유된 부재료를 혼합물에 첨가하므로 영양성분이 향상된 효과가 있다.