Fault detection device of power tube amplification module

The invention discloses a fault detection device of a power tube amplification module. The fault detection device comprises at least two directional couplers, at least two detectors and a control protection circuit, and is characterized in that the two directional couplers are used for detecting power signals of an input end and an output end, are divided into an input detector and an output detector and are respectively connected with the two directional couplers, and are used for demodulating an input power signal to obtain a power modulation signal and inputting the power modulation signalinto the control protection circuit; the control protection circuit is used for controlling the power tube amplification module to stop working when the signal inputted by any detector is greater thanthe corresponding threshold value or the drain voltage of the power tube is greater than the corresponding threshold value, and is used for controlling the gate voltage to be applied to the power tube before the drain voltage