Abstract: Improvement in a log-splitting attachment device that is adapted to be connected to an apparatus, e.g., a backhoe, having a hydraulically-powered cylinder-piston combination, after removal of the element, e.g., a bucket, normally moved by the piston, to provide a reciprocating log-splitting machine, the improvement including a plunger block element removeably connectable to the free end of the piston and having laterally extending flange means, and further including a frame means removeably connectable to the cylinder of the piston-cylinder combination and having a base plate element and side plate elements for supporting a log to be split, slot means adjacent the base plate for guiding the plunger element during the reciprocation of the piston, and a blade element positioned vertically on the end of the base plate against which a log is forced by the piston-plunger element to split the log.