The invention belongs to a bias matcher matched with a quadrature modulator, which comprises a blocking circuit, an alternating current (AC) matching interface circuit, a direct current (DC) bias circuit, two pairs of differential AC voltage input ports and two pairs of corresponding output ports. As a voltage division circuit shared by DC bias unit circuits is arranged between a DC power supply and a grounding end, and all blocking capacitors are re-arranged at the input ends of AC power supplies of the corresponding bias matching circuits, a grounding resistor in the voltage division circuit no longer has the function of a biasing resistor, while a corresponding AC matching resistor has the function of the biasing resistor respectively. Therefore, the bias matcher matched with the quadrature modulator is characterized in that: the circuit structure and the production process are simple, the requirement on performance consistency of the elements such as the resistor, the capacitor and the like is low, the consistency of performance parameters between the bias matching unit circuits and the matching between the quadrature modulators are high, the anti-interference capability of a signal is effectively improved, the spectrum distortion of the signal is inhibited; and the bias matcher can be industrially produced on a large scale, the production efficiency is high and the cost is low.