The invention relates to an automatic cushion block for a worktable of a laminating machine. The automatic cushion block comprises an ejector rod, a pressure rod is movably arranged in the middle of the ejector rod in a penetrating manner, a base is movably sheathed on the outer side of the ejector rod, a limiting groove is formed in the base, a plurality of limiting blocks are movably hinged to the bottom of the ejector rod, each of the limiting blocks comprises a moving part and a power part, a hinged position of the moving part to the power part is taken as a demarcation point, the moving part is arranged corresponding to the bottom of the pressure rod, the power part is arranged corresponding to the limiting groove in position, the outermost edge of the power part does not exceed the outermost edge of the ejector rod under the situation that the pressure rod does not apply forces onto the moving part, and the outermost edge of the power part extends out of the outermost edge of theejector rod under the situation that the pressure rod applies forces onto the moving part. The automatic cushion block provided by the invention has the benefits that as the ejector rod is separatedfrom the pressure rod, the pressure rod realizes overall locking, and the ejector rod realizes overall movement, so that when the automatic cushion block can be used on the worktable of the laminatingmachine, corresponding responses to different plates are made, and the automatic control is realized by means of a mechanical structure.