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.