A pressure plate bearing device assembled by quick connection comprising a bearing and a pressure plate ; wherein the pressure plate comprises a sleeving hole which sleeves outside an outer race of the bearing ; a limiting groove is provided in a position where the outer race of the bearing is nested in the sleeving hole in a matching manner; a steel ball is arranged in the limiting groove; a limiting match between the steel ball and the sleeving hole and a limiting match between the steel ball and the outer race of the bearing at least form an axial limit between the bearing and the pressure plate ; the outer race of the bearing or the pressure plate is provided with a mounting channel in communication with the limiting groove characterized in that it comprises a limiting member configured for limiting and holding the steel ball in the limiting groove arranged in the mounting channel and the mounting channel is provided in the pressure plate , and the limiting groove comprises an annular rolling groove provided in an outer circumferential surface of the outer race of the bearing and a groove provided in an inner circumferential surface of the sleeving hole of the pressure plate and the mounting channel comprises a radial extension section and an axial extension section ; the first end of the radial extension section is connected to the inner circumferential surface of the sleeving hole ; the axial extension section is provided with a mounting hole at an axial end face on at least one side of the pressure plate ; the limiting member is fixed into the axial extension section in a penetrating manner; a ball support is movably arranged in the radial extension section ; and a first end of the ball support is provided with a ball socket in rolling contact with the steel ball in a matching manner, and a second end of the ball support abuts against the limiting member in a matching manner for a limit. wherein the pressure plate comprises a sleeving hole which sleeves outside an outer race of the bearing ; a limiting groove is provided in a position where the outer race of the bearing is nested in the sleeving hole in a matching manner; a steel ball is arranged in the limiting groove; a limiting match between the steel ball and the sleeving hole and a limiting match between the steel ball and the outer race of the bearing at least form an axial limit between the bearing and the pressure plate ; the outer race of the bearing or the pressure plate is provided with a mounting channel in communication with the limiting groove characterized in that it comprises a limiting member configured for limiting and holding the steel ball in the limiting groove arranged in the mounting channel and the mounting channel is provided in the pressure plate , and the limiting groove comprises an annular rolling groove provided in an outer circumferential surface of the outer race of the bearing and a groove provided in an inner circumferential surface of the sleeving hole of the pressure plate and the mounting channel comprises a radial extension section and an axial extension section ; the first end of the radial extension section is connected to the inner circumferential surface of the sleeving hole ; the axial extension section is provided with a mounting hole at an axial end face on at least one side of the pressure plate ; the limiting member is fixed into the axial extension section in a penetrating manner; a ball support is movably arranged in the radial extension section ; and a first end of the ball support is provided with a ball socket in rolling contact with the steel ball in a matching manner, and a second end of the ball support abuts against the limiting member in a matching manner for a limit. <EOS>