The utility model relates to an arrange watermark system of encrypting of printer front end in, include: the shell sets up circuit board in the shell, with printing interface and interface fixing device that the circuit board is connected, be provided with communication device, controller, memory, watermark interpolation device, watermark information storage ware on the circuit board, print the content buffer, interface fixing device includes casing, two sucking discs, respectively with two two double -screw bolts of sucking disc fixed connection, two lock cores. The utility model provides an arrange watermark system of encrypting of printer front end in can be connected with current printer conveniently, need not to change the printer and can realize watermark encryption printing, need not manual interpolation watermark, has improved the staff's of enterprise efficiency.