Targeting smart airports， modern airport communication networks must simultaneously support deterministic low-latency transmission for safety-critical services and high-throughput data delivery. Existing scheduling and load balancing methods struggle to balance both requirements. To address this challenge， this paper proposes a framework of multi-level load balance algorithm based on time-sensitive networking. First， dynamic priority scheduling establishes hierarchical service-tier mappings with temporary escalation support for critical operations. Second， queueing delay-aware load balancing quantifies link capacity via real-time metrics to enable optimal egress selection. Finally， multi-priority queue coordination unifies these mechanisms through stateful management， enabling holistic multi-priority egress decisions that maximize bandwidth utilization and boost throughput. Experiments show the proposed framework reduces latency for critical services by 63% and increases overall throughput by 40% compared to benchmarks like equal-cost multi-path（ECMP）routing， delay-based load balance（ DLB）， practical information-agnostic flow scheduling， namely PIAS， time-sensitive networking（TSN）. It effectively mitigates the low-latency versus high-throughput conflict.