Taiwan Blue Magpies are well-known scavengers and omnivores who enjoy eating plants, fruits, seeds, rodents, snakes, and tiny insects. They do, however, like fruit, with papayas and wild figs topping the list. It has been seen that they place leftovers on the ground and cover them with leaves so they may be retrieved later. They may store food in the branches or leaves.

Formosan Birds called blue magpies are monogamous. Typically, weeds and woodlands are where they build their nests. From March through April, rendezvous places are mostly constructed on higher branches. The nest is made of weeds and twigs and has a bowl-like form. Males assist in feeding and constructing the nest, while females incubate the eggs. Typically, a nest has 3–8 eggs. The colour of eggs is an olive green with dark brown markings. Hatching has a success rate of 78.3% and takes 17–19 days. Per nest, this will result in 3–7 chicks. Strong nest defence behaviour can be observed in blue magpies. They will ruthlessly assault intrusions until they flee.

The species is now considered to be of Least Concern on the IUCN Red List of Threatened Species since it is widespread across its range. The Formosan Blue Magpie, however, has been classified as a rare and important species because of its endemism.

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