The invention discloses a universal detection device of an engine valve lift, which comprises a dial indicator, a fixed frame, a connecting plate, a speed reducing mechanism, a first angle dial and a second angle dial, wherein the fixed frame is fixedly connected with the speed reducing mechanism, the speed reducing mechanism is fixedly connected with the connecting plate, the first angle dial is arranged on the output shaft of the speed reducing mechanism, and the dial indicator is fixedly connected with the second angle dial. The universal detection device can be used as fixed equipment for long-term use and can ensure the precision since references are relatively fixed; the references of all the parts of the device are unified, the errors are fixed, the precision is within an acceptable range, and a relative error limit can be computed through absolute errors; the axial line of the dial indicator and the axial line of a valve rod are easily adjusted to be collinear, and the valve stroke can be truly reflected through measured numerical values; through the two-stage speed reducing mechanism, the rotating speed of the output shaft can be decreased, the torque of an input shaft is reduced, the operation is quite easy, and particularly a unidirectional clutch prevents the input shaft from reversely rotating and further ensures the rotating accuracy of the input shaft; and the device has strong adaptability.