Engineering machinery pile driver

The utility model relates to the technical field of engineering machinery, and discloses an engineering machinery pile driver which comprises a positioning disc, a positioning assembly used for positioning piles is installed on the top of the positioning disc, an installation frame is fixedly connected to the top of the positioning disc, and a pile driving mechanism used for driving piles is installed on the inner top wall of the installation frame. The positioning assembly comprises a positioning frame fixedly connected to the top of the positioning disc, the top of the positioning disc is provided with a positioning hole communicating with the inner side of the positioning frame, the outer side of the positioning frame is fixedly connected with four inner threaded cylinders which are evenly distributed, and the inner sides of the inner threaded cylinders are in threaded connection with threaded rods; the end, away from the positioning frame, of the threaded rod is fixedly connected with a cross-shaped handl