The invention provides a power detecting circuit for solving the problems that the practical transmitting power of a traditional power detecting circuit easily changes along with the change of frequency and environmental temperature, is not flat enough, and has larger transmitting power fluctuation. The circuit comprises a main chip, a power amplifier, a diplexer and a coupler, wherein the main chip is used for outputting radio frequency power signals; the output end of the main chip is coupled to the power amplifier; the power amplifier is used for amplifying the radio frequency power signals; the output end of the power amplifier is coupled to the diplexer; and the output end of the diplexer is coupled to the coupler; one output end of the coupler is coupled with an antenna, and the other output end is used for feeding back to the main chip. The invention also provides radio equipment comprising the power detecting circuit. The power detecting circuit and the radio equipment provided by the invention obviously reduce the change of the practical transmitting power along with the frequency and the temperature, and remarkably flat the characteristic of the transmitting power changing along with the frequency and the temperature, thereby enhancing the radio performance of the equipment.