The invention relates to the field of biomedicine, in particular to a construction method of a liver unit stent, a liver unit stent and application of the liver unit stent in the field of drug testing. The invention aims to provide a construction method of a liver unit stent, a liver unit stent and application of the liver unit stent in the field of drug testing. The construction method of the liver unit stent comprises the following steps: a gelled first composition, which includes hepatic parenchymatous cells and a biodegradable material, is loaded into a biological 3D printer, and an intermediate is printed according to a preset path; a cross-linking agent is dropwise added to the intermediate such that the biodegradable material in the intermediate is cross-linked to form a liver unitstent, wherein a channel is formed in the liver unit stent. In the liver unit stent, cell variety, quantity and position are controllable and the channel is controllable, thus providing a microenvironment for different cells. In addition, the liver unit stent can be used for researching the drug hepatotoxicity of new drugs and is used for detecting drug metabolites, gene expression, protein expression, cell apoptosis and cell proliferation.