The invention relates to an anti-saturation high-
gain self-adaptive offset type ground
nuclear magnetic resonance signal amplification apparatus. In a high-
noise environment, in case of too high gains, output of an
amplifier is satirized, and in case of too low gains,
nuclear magnetic resonance signals cannot be effectively amplified. According to the invention, the ground
nuclear magnetic resonance signals are received by use of one or more main channels, and ambient
noise is received through one or more reference channels. After passing through a front
amplifier and a
band pass filter, receiving data passes through an analog-to-
digital converter and then enters a self-adaptive
noise canceller. By use of a variable step self-
adaptive algorithm, the ambient noise in a learning
main channel is adaptively tracked, the noise is subjected to analog quantity subtraction in the
main channel after passing through a digital-to-analog converter, and high-
gain amplification is then carried out after the correlation ambient noise can be effectively filtered, such that saturation of a final
amplifier can be prevented, and at the same time, the requirement for resolution of a
data acquisition system is met.