The utility model belongs to the technical field of the radio frequency, a radio -frequency device is disclosed, be applied to the radio -frequency channel circuit, radio -frequency device includes: asingle -pole double -throw, the 2nd single -pole double -throw, amplifier and digital control attenuator, the adio -frequency signal input end who regards as radio -frequency device is held in movingof a single -pole double -throw, and the input of amplifier and digital control attenuator's input are connected respectively to two motionless ends, the 2nd single -pole double -throw's a motionlessend is connected to the output of amplifier, and another motionless end of the 2nd single -pole double -throw is connected to digital control attenuator's output, and the adio -frequency signal output end who regards as radio -frequency device is held in moving of the 2nd single -pole double -throw. The utility model discloses can overcoming in the current radio -frequency channel circuit digitalcontrol attenuator and amplifier, to cascade the output noise power who arouses big, unable satisfy produce the not enough of small -signal, low output noise power can effectively fall, increase output signal's dynamic.