The invention relates to a magnetic resonance receiver based on heterogeneous double cores, and the receiver employs a programmable gain amplification chip, carries out two types of amplification of a weak magnetic resonance radio-frequency signal: solid gain amplification and variable gain amplification, and reduces the size of a dynamic range of the magnetic resonance signal. An output signal of a variable gain amplifier is filtered by an FIR filter, and then is transmitted to an analog-digital converter for analog-digital conversion. After conversion, the digital signal and a reference signal generated by a digital oscillator are mixed, and the mixed frequency signal is filtered by a low pass filter and then the digital downconversion of the mixed frequency signal is carried out, wherein a high-frequency interference signal in the mixed frequency signal is filtered, thereby achieving the carrier frequency processing of a signal. The two ways of obtained data are transmitted to a third-generation double-data-rate synchronous dynamic random access memory for image reconstruction, and the outputted magnetic resonance data is transmitted to a VGA display for display. The receiver is compact in structure, is high in reconfigurability, is high in sampling speed and is low in cost. Moreover, the implementation of variable gain greatly improves the SNR of the reconstructed image.