The invention relates to a production method for quartz fiber blended yarns, which belongs to the field of production and manufacture of the quartz fiber blended yarns. The production method is characterized in that PBO (Poly(P-phenylene Benzobisoxazole)) fiber precursors and quartz fiber precursors are degraded and twisted according to a certain proportion, blended single yarns with certain strand numbers are doubled and twisted, and finally the quartz fiber blended yarns with the density of 1.5-2.1g/cm<3> are produced. The quartz fiber blended yarns disclosed by the invention integrate respective advantages of two kinds of high-performance fibers, have the characteristics of high temperature resistance, low dielectric constant and dielectric loss, low linear expansion coefficient, high strength, high modulus, low density and the like, and are particularly suitable for preparing wave-transmitting resin-based composite materials with high strength, high heat resistance, low density and the like of a high-performance structure.