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Data collection and transmission system is the key subject for aerocraft telemetry system. Avoiding high bit error rate and telemetry precision deterioration is the crucial subject under high bit-rate transmission. For the multi-parameter rapid switch of collection and transmission system, a star topology links collection and transmission system suitable for aircraft is introduced on the basis of multiple network topology structures, which can eliminate time error created by different crystal oscillator. Practice indicates that the system can effectively meet the demands of isolated acquisition and transmission and fault isolation, and the signal insulation resistance is above 100MΩ and the isolation acquisition accuracy is within 1%, acquisition voltage can be rapidly achieved within the first 0.2 acquisition period under 7Mbps transmission condition. This data collection and transmission system can satisfy the requirements of large capacity and high reliability.