Method, device and system for converting and outputting print data

The invention discloses a method, a device and a system for converting and outputting print data and aims to convert print data which a control device outputs, into electronic documents convenient to remotely check and view. The method includes the steps: print data which a data acquisition device acquires and which the control device transmits to a printer is received and is written into a data cache area; whether the print data is completely received or not is judged, if not, the print data is continuously received, if yes, the print data in the data cache area is stored, and the data cache area is emptied; the stored print data is divided into control data, character data and image data according to a printing protocol; the character data or the image data is converted into intermediate-formatted data according to the control data, the intermediate-formatted data is output and displayed in an image output area, and display data corresponding to the print data is generated.