The invention relates to the technical field of ink-jet printing, and particularly discloses printing liquid for printing Bank, the printing liquid comprises ink, and the ink comprises the following components: 5%-30% of absorptive filler or light reflective filler; 15-30% of an optical resin; 3-10% of a dispersion matrix; 0.5-3% of a photoinitiator; 5-15% of a thermosetting resin; and a solvent.Further, an inkjet printer and a Bank preparation method using the inkjet printer are disclosed. The printing liquid provided by the invention can be suitable for the ink-jet printer to print a Bank,the Bank printed by the printing liquid has color or light reflection property, optical crosstalk between sub-pixels can be avoided, the selection of materials can meet the requirement of mu LED display, the preparation method is realized through the ink-jet printer, and the process of one-time printing and one-time heating of the Bank is realized. According to a multi-time laminated printing heating method, large-thickness Bank preparation can be met, the printing area can be selected according to the actual situation, the whole pixel defining layer does not need to be prepared, resources aresaved, and the working procedure is shortened.