The invention belongs to the technical field of tea leave processing and particularly relates to a production method of concentrated tea liquor. The production method includes the steps of firstly, fermenting, to be more specific, adding raw material tea into a fermentation tank, sterilizing, cooling, adding water, inoculating with Eurotium cristatum inoculation liquid, and performing solid-liquid fermentation; secondly, performing solid-liquid separation, to be more specific, performing primary solid-liquid separation on fermented liquid to remove tea residues, and using a ceramic film to finely filter primary filtrate to obtain tea extract; thirdly, concentrating the tea extract to obtain the concentrated tea liquor; fourthly, sterilizing the concentrated tea liquor to obtain the concentrated tea liquor product. The production method has the advantages that tea produced by various production processes such as a dark tea production process, a black tea production process, a green tea production process and a white tea production process, and the production method is simple in process, capable of lowering tea fragrance loss, effective component loss and characteristic flavor substance reduction during concentrated tea liquor production and capable of producing the concentrated tea liquor product smooth and mellow in taste.