The invention discloses a printing paper transfer device and a portable thermosensitive printer. The printing paper transfer device comprises a support frame arranged on the inner side surface of a paper bin cover, and a driving shaft rotationally connected with the support frame; the driving shaft is used for outputting printed label papers, and is provided with multiple grooves peripherally arranged; and the multiple grooves are uniformly arranged at intervals. The printing paper transfer device effectively solves the printing problem of no-bottom-paper label papers, meanwhile, can print both coiled no-bottom-paper label papers and bottom-paper label papers, and is better in generality and adaptability. Correspondingly, the printing paper transfer device also prevents environmental pollution and resource waste phenomenon caused by use of bottom papers in the prior art, and facilitates popularization and application.