Abstract: A fresh agricultural products supply chain based on the theory of complex networks has been constructed to investigate the impact of under-load cascading failure caused by chain breakages on comprehensive invulnerability. Then, an under-load cascading failure model that considers the transport efficiency and freshness loss of fresh agricultural products was presented. It was described from five perspectives: enterprise initial inventory, upper and lower limit of inventory capacity, enterprise under-load failure probability, enterprise inventory diversion mechanism, and enterprise emergency recovery mechanism. Through the numerical simulation of the invulnerability of network nodes and edges with random attacks and deliberate attacks, the results show that: Under random attack mode, the edges are more vulnerable than nodes under the effects of cascading failures; Under the deliberate attack mode, the over-centralized cooperation mode can reduce the node-invulnerability, but not obvious to edge fluidity; Both risk recovery input and inventory security input have optimal ranges, but the former is more beneficial to improving the comprehensive invulnerability of the network. According to the report, enterprises can enhance risk resistance and build the decentralized cooperation model when optimizing the network, allowing the network to be more stable.