The invention discloses a protective relaying device and method for traditional station and intelligent station integration. The protective relaying device comprises a CPU, a traditional analog quantity acquisition unit, a digital analog quantity acquisition unit, an entrance unit, an exit unit and a man-machine interface plug-in, wherein the CPU comprises double MCUs; the traditional analog quantity acquisition unit comprises a conventional mutual inductor, a double path low pass filtering return circuit and a double path A/D sampling return circuit that are orderly connected; the digital analog quantity acquisition unit comprises an electronic mutual inductor and a data merging unit that are orderly connected; the entrance unit comprises an entrance module, an optical isolation part and an interface module that are orderly connected; the exit unit comprises an exit relay, an optical isolation part and an interface module that are orderly connected; the man-machine interface plug-in comprises a man-machine conversation MCU. The invention also puts forward a protective relaying method for traditional station and intelligent station integration. The protective relaying device and method are characterized by simple structure, convenience of use, high reliability, stable operation, reliable movement, rapid installation debugging and wide application scope.