The invention discloses a broadband high-performance attenuator circuit, which belongs to the technical field of microwaves and comprises a plurality of resistors, wherein a first resistor is a parallel resistor, one end of the first resistor is connected with one end of a second resistor while the other end thereof is connected with a metal pad; the second resistor is a series resistor, an inputend and an output end of the second resistor both are connected with the metal pad; one end of each of the other resistors is hung in the air while the other end thereof is distributed on the metal pad, and a distribution length on the metal pad is corresponding to the length of the second resistor; the metal pad connected with the second resistor is the input end or the output end of a microwavesignal; and the metal pads connected with the first resistor and the other multiple resistors are all grounds. According to the broadband high-performance attenuator circuit, adjustment of a standing-wave ratio and an attenuation accuracy index of the attenuator circuit can be realized through adjustment of the number, positions, width and length of the other multiple resistors, a defect of poor attenuation accuracy or poor standing-wave ratio of the existing technology is overcome, and engineering requirements are satisfied.