With the advancement of beyond-5G networks, privacy-preserving communication and secure computation face critical challenges due to the openness of wireless channels. Existing security mechanisms protect data transmission but fail to secure the computation process itself. In this paper, we propose a UAV-assisted secure computing framework that integrates Cheon Kim Kim Song (CKKS) fully homomorphic encryption (FHE) with multi-party secure computation (MPC). Leveraging UAV flexibility, our framework decouples key distribution from encrypted computation, enabling secure encrypted weighted aggregation (EWA), encrypted matrix multiplication (EMM), and encrypted decision tree (EDT) inference. Experimental results show that our framework outperforms existing schemes: for EDT, it supports floating-point operations and achieves better time efficiency than Brakerski-Fan-Vercauteren (BFV); for EMM, it demonstrates superior time and space efficiency compared to Brakerski-Gentry-Vaikuntanathan (BGV) and Somewhat Homo- morphic Encryption (SHE); while for EWA, it ensures high numerical precision and robustness across varying data length.

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