Conventional interfaces for a Josephson-CMOS hybrid system typically rely on Josephson latching drivers (JLDs) or SQUID (Superconducting Quantum InterferenceDevice) stacks to convert weak signals, which are then connected to additional amplifiers providing outputs of 1.2 V or 1.8 V. JLDs output tens of millivolts but require AC bias and precise clock alignment. SQUID stacks reach frequencies of tens of GHz but output few millivolts voltages and occupy large area. To address these challenges, an interface based on SiGe BiCMOS(Silicon-Germanium Bipolar Complementary Metal-Oxide-Semiconductor) has been designed, fabricated, and tested. Fabricated using the 130 nm SiGe BiCMOS process, the interface converts 200 μV voltage signals to 1.2 V and consumes only 386 μW per channel at 4.2 K. In low-frequency measurement, the hybrid system supports 21-channel signals conversion without requiring additional CMOS amplifiers, simplifying cryogenic system design. Advantages include eliminating the need for AC bias and clock alignment, while drawbacks like limited speed are also discussed. This technology facilitates the practical application of multichannel superconducting computers and other applications that require efficient signal conversion, making it one of the most promising interface solutions for the hybrid system.