The invention relates to a label information conversion method and device and a printing method and system. The label information conversion method for achieving fast printing comprises the following steps that 1, data needing to be printed in a CAD blueprint is converted into a tabular form, and table information is generated; 2, the table information is converted into corresponding letters and/or figures according to a preset conversion rule; 3, the letters and/or figures are sent to an electronic lettering machine for printing. According to the label information conversion method and device and the printing method and system, specially-assigned person charge is not needed, time is saved, manpower is saved, and cost is reduced; meanwhile, it is avoided that manual input is wrong, and consequently rework is caused to waste materials. Basically no additional cost is needed, the structure is simple, and operation is easy.