The invention discloses an intelligent cost-control current-limiting circuit breaker device with an earth leakage protection function. The device is characterized by comprises an earth leakage protection unit for comparing an earth leakage current signal detected by a zero-sequence transformer with a preset earth leakage current threshold, and acting according to an earth leakage protection control signal when the earth leakage current signal achieves the preset earth leakage current threshold, thereby enabling the circuit breaker to be in off position; a voltage fault protection unit for comparing a fault electric signal collected by an electric signal collector with a preset fault electric signal, and acting through a transmission mechanism according to a voltage fault protection controlsignal of the control circuit board when the collected fault electric signal achieves the preset fault electric signal threshold, thereby enabling the circuit breaker to be in the off position; and an electric parameter detection unit for converting the circuit electric measurement signal collected by the electric signal collector into the required electric parameter signal, and sending the electric parameter signal to the external equipment through a communication module.