The invention belongs to the technical field of automobile part machining, and particularly relates to an automatic taking device for a new energy automobile spring plate sub-assembly mechanical machining. The device comprises a top plate, wherein a motor box is arranged at the top end of the top plate, and the top end of the motor box is in threaded connection with an adjusting screw rod; and a worm is rotationally connected to the center position of the top end of the top plate, and the adjusting screw rod penetrates through an inner cavity of the worm. The adjusting screw rod and the worm are arranged, and a mounting plate is rotationally connected to the bottom end of the worm, so that when a motor drives the worm to rotate, the worm drives the adjusting screw rod and a worm gear to rotate; and meanwhile, a grabbing block is driven to move oppositely, so that an automobile sub-plate assembly is grabbed, and the problem that industrial injury accidents are prone to occur due to highlabor intensity and great risk when personnel operating a workpiece for stamping operation at a close distance due to the fact that a manual feeding operation mode is generally adopted by the machining process in the prior art is avoided.