The utility model relates to a power amplitude limit protection circuit applied to a receiver. The circuit comprises a wave detection chip and PIN tubes, an AD8310 chip is adopted as the wave detection chip, the circuit is used for fulfilling a large power signal amplitude limit function, received signals are input through the left end of a capacitor C1 and are output through the right end of a capacitor C3, a capacitor C2 is a blocking capacitor, a capacitor C4 serves as a coupling capacitor connected to a signal main link, and a coupling coefficient is changed through adjustment of the resistance value of a resistor R1; through the magnitude of the power of signals entering the wave detection chip, the power of input signals can be can be detected; through adjustment of the resistance values of a resistor R3 and a resistor R4, direct current voltage applied on the wave detection chip can be changed, and an amplitude limit threshold of input large signal power can be changed. A circuit board is small in area, and low in cost and difficulty. Viewed from an application angle, when the receiver is small in size and requirements for the receiver is not high, the power amplitude limit protection circuit can be used in a flexible manner, and combination of realization large power signal amplitude limit and small signal power amplitude limit can be realized.