A method for the production of phosphoric acid comprising a phosphate ore attack by a first aqueous chlorohydric acid solution, separation in the attack liquor between a solid insoluble phase containing impurities and a separate aqueous phase comprising phosphate ions in a solution, chloride ions and calcium ions, neutralization of said attack phase separated from the liquor by adding a calcium compound so that water-insoluble calcium phosphate can be formed with said phosphate ions, precipitating a separation in said neutralized aqueous phase comprising chloride ions and calcium ions in a solution and a solid precipitated phase based on said water-insoluble calcium phosphate, and solubilization of at least one part of the precipitated solid phase in a separated manner in a second aqueous chlorohydric acid solution, with formation of an aqueous solution containing phosphate ions, chloride ions and calcium ions to be extracted by an organic extractant in a liquid-liquid-type extraction.