To address the issues of low transmission rate， high transmission delay， and difficulty in ensuring multi-service quality of service （QoS） in transoceanic aeronautical ad-hoc networks（AANET） with single-channel space-time division multiple access （STDMA） protocols， this paper proposes a?multi-channel distributed STDMA slot scheduling method based on directional antenna. Firstly， a system model for the transoceanic aeronautical ad-hoc network is established， and a link model is constructed based on directional antennas. Secondly， a system transmission scheme is proposed， which adopts distributed reservation-based STDMA and introduces a sliding weighted average to statistically measure the data frame arrival rate. Dynamic time slot allocation and removal are performed according to the data frame arrival rate and transmission rate， while periodic broadcasting of time slot scheduling tables achieves synchronization of time slot allocation information within the network. Finally， a transoceanic aeronautical ad-hoc network simulation system is built using OMNeT⁺⁺， and the organized track system （OTS） is employed to generate a node distribution model under real transoceanic scenarios. The performance of the proposed method is evaluated through simulations. Research results show that under high-density and high-load conditions， the proposed method can guarantee multi-service QoS. The end-to-end delays of air traffic service （ATS） and aeronautical operational control （AOC） services remain convergent. The delivery rate is maintained above 95%， and aeronautical administrative communication （AAC） and aeronautical passenger communication （APC） services achieve sustained transmission.