The invention discloses a preparation method of a solid-phase Fenton catalyst for bisphenol A organic wastewater treatment. The method comprises the following steps: 1) respectively mixing Al(NO3)3.9H2O, Mg(NO3)2.6H2O, Fe(NO3)3.9H2O and pure water to prepare a mixed solution marked as (1), dissolving Na2CO3 in pure water and marking as (2), and preparing a pH14 NaOH solution marked as (3); 2) putting (1) into a constant temperature heating magnetic water-bath kettle, and mixing and stirring with magneton at the temperature of 60 DEG C; 3) fixing an acid buret above (2), respectively pouring (1) into the acid buret to slowly drop into a 500ml beaker below, controlling flow velocity and controlling the whole mixing process to last for 1 h during the titration process, ceaselessly adding (3), and maintaining pH of the mixed liquor (2) to be 10; 4) standing for 24 h after titration, washing with pure water for three times, filtering by a suction filter, drying a solid in a drying oven at 100 DEG C for 12h, taking out and crushing by a grinder to obtain powder of Fe-Mg-Al hydrotalcite; and 5) respectively putting into a crucible, putting into a muffle furnace, setting temperature to500 DEG C and calcining, cooling and taking out so as to obtain a catalyst.