The invention relates to an iron-contained molybdenum ore beneficiation process. In raw ores, the molybdenum grade is 0.1%, and the iron grade is 4%. The iron-contained molybdenum ore beneficiation process is characterized by comprising the following steps: the raw ores with the particle size of 0-12 mm, the molybdenum grade of 0.1% and the iron grade of 4% are fed in a first-section ore grindinghydrocyclone for closed circuit ore grinding classification operation; overflowing ores of the first-section ore grinding hydrocyclone with 55% of the particle size of -0.076 mm are fed in first-section molybdenum and iron mixing direct flotation operation; primary flotation concentrates with the molybdenum grade of 18%, the molybdenum recovery rate of 98.5% and the iron grade of 9.5% are fed in strong magnetic roughing to enter a weak-magnetism mineral iron removing system; and concentrates obtained by weak magnetic iron removal are fed in a second-section ore grinding cydrocyclone for closedcircuit ore grinding classification operation and second-section molybdenum and iron mixing direct floatation operation to obtain final molybdenum concentrates with the molybdenum grade of 55%, the molybdenum recovery rate of 85%, the iron grade of 1.5% and the yield of 0.155%.