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Due to the problems of long detection delay and low detection accuracy in the existing random access preamble detection system for LEO satellite mobile communication, a random access preamble detection system based on MRLs is proposed. The preamble formatter, preamble sequencer, preamble duration calculator and random signal transmitter are optimized respectively. The differential detection and correlation detection are carried out according to MRLs algorithm, and the subcarrier offset frequency parameters are calculated by conjugate operation to complete random access to the preamble detection system. The experimental results show that: compared with the existing detection system, the designed detection system can well reduce the detection delay time, has higher inspection accuracy, and can better adapt to the LEO satellite mobile communication system, with good detection effect and strong practicability.