The invention discloses a carton folding robot. The carton folding robot comprises a double-arm robot, a driven first mechanical hand, a second mechanical hand and an auxiliary bottom sealing tool, wherein the auxiliary bottom sealing tool is positioned under the position between the first mechanical hand and the second mechanical hand; the second mechanical hand comprises a driving arm connectedwith a robot body, a second mounting base plate connected with the driving arm, a sucking disc component arranged on the second mounting base plate, an auxiliary positioning mechanism and a closing mechanism; the auxiliary bottom sealing tool comprises a supporting base plate, an upper closing plate, a lower closing plate, an auxiliary plate and a locking plate; and the first mechanical hand and the second mechanical hand are clamped and matched on the supporting base plate to move back and forth, so that the bottom surface of a carton is closed and locked. The first mechanical hand grabs andopens the folded carton, and then the second mechanical hand clamps and positions the carton, so that a left bottom board and a right bottom board of the bottom surface of the carton are folded and closed, a front side board and a rear side board of the bottom surface of the carton are folded by the auxiliary bottom sealing tool, and thus the bottom surface of the carton is quickly closed and locked.