In the space solar telescope(SST),the image integration method is used to increase signal-to-noise ratio(SNR)of the solar magnetic field images.In the image integration,the conventional correlator based on image intensity can't simultaneously satisfy the real-time and low resources consumption in spatial mission.This paper proposes a 1 bit correlator to accomplish fast image correlation.Replacing usual multiplication by XOR Boolean operation,the 1 bit correlation algorithm can both accelerate the computation and reduce the complexity of hardware.Oriented to the solar granulation images,this paper presents the algorithm and the FPGA+DSP implementation in detail.The experimental results demonstrate that the 1 bit correlator satisfies well the computation precision and time requrements of image integration in the SST,and its FPGA resource consumption is only 1/10 of that of FFT-based(8 bit data)correlator.