Aiming at the shortcomings of the traditional timing equipment of the timing accumulating error and the difficulty of calibration, a low frequency code-timing receiving system which was using MSP430 MCU as the control core is designed. The system receives the timing code signal from the ferrite rod antenna, and after being subjected to frequency selective amplification and filtering processing, it is sent to the single chip microcomputer for signal decoding, thereby calibrating and updating the system clock. In this paper, the characteristics of timing code coding format are analyzed, and a set of signal decoding algorithms is designed. The low frequency timing code signal is susceptible to electromagnetic interference. The anti-interference ability of the system is effectively improved by combining active low-pass filter circuit and digital filtering. The experimental test shows that the system can synchronize with the national time center standard time through the automatic calibration function, and can also start the forced calibration when needed to eliminate the accumulated error of time, and the timing precision can reach 1 second.