The invention discloses PCM comprehensive multiplexing equipment with stable conversation. The PCM comprehensive multiplexing equipment comprises a ringing signal module, an SLIC (Single Level Integrated Circuit) chip and a power supply circuit; the power supply circuit comprises a main power supply and a magnetic bead, one end of the magnetic bead is connected to the main power supply, and the other end outputs an isolation power supply; the isolation power supply and the main power supply are connected to the SLIC chip to provide different power supplies; the ringing signal module is connected to the SLIC chip to provide a ringing signal and a feedback power supply; one end of the magnetic bead outputs isolation power supply and is further connected with an electrolytic capacitor 6EC4 inseries and then grounded, and the positive electrode of the electrolytic capacitor 6EC4 is connected to the magnetic bead. According to the invention, different power supplies can be provided for theSLIC control chip, so that the working stability of each integrated device in the SLIC chip is improved.