The invention relates to a boss embedding type diaphragm filter plate which can be kept nondeformable under pressure. The boss embedding-type diaphragm filter plate comprises a diaphragm and a filter plate. The diaphragm is positioned on one surface of the filter plate. Four supporting boss parts of the diaphragm are provided with round holes, and the round holes are hermetically sheathed on foursupporting bosses in the filter plate. The boss embedding-type diaphragm filter plate has the advantages that the boss embedding-type diaphragm filter plate intrinsically avoids the defect in the background technology, namely filter plate supporting boss surfaces and interposed diaphragms among the boss surfaces suffer stresses; direct force transfer among the filter plate supporting boss surfaces among a plurality of single-surface diaphragm filter plates is realized; the filter plate is ensured to be free from deformation, crack or rupture; the service life of the filter plate is greatly prolonged.