The invention relates to a gravity separation-flotation combined beneficiation process for phosphate ores. The gravity separation-flotation combined beneficiation process for phosphate ores comprisesthe following steps: feeding phosphate ore pulp into a three-segment spiral chute gravity separation process to obtain reselected concentrate and reselected tailings; feeding the reselected concentrate into a desilicication reverse flotation process to obtain desilicicated concentrate and desilicicated tailings; feeding the desilicicated concentrate into a magnesium removal reverse flotation process to obtain double reverse concentrate and magnesium removal tailings; feeding the reselected tailings into a thickener to be concentrated to obtain a thick bottom flow; feeding the thick bottom flowinto a direct flotation process to obtain direct flotation concentrate and direct flotation tailings; feeding the direct flotation concentrate into a reverse flotation process to obtain direct and reverse concentrate and reverse flotation tailings; combining the desilicicated tailings, the direct flotation tailings and the reverse flotation tailings to obtain final phosphate tailings; and combining the double reverse concentrate with the direct and reverse concentrate to obtain the final phosphate concentrate. The process has the advantages that the desilicication reverse flotation is free ofslurry interference, the silicate removal efficiency is high, direct flotation is free of coarse grain level interference, the consumption of a reagent is low, the yield of a foamed product floatingin the beneficiation process is low, and a flowage structure is good in stability and high in controllability.