The invention relates to a touch type yarn detector of a rotor spinning machine, comprising a processor (1), an infrared emitter (2), an infrared receiver (3), a status indicator lamp (4), a filter (5), a cotton feeding button (6) and a joint button (7); wherein the infrared emitter (2) and the infrared receiver (3) are respectively connected with the processor (1) by virtue of the filter (5); the processor (1) is connected with the status indicator lamp (4); the cotton feeding button (6) and the joint button (7) are respectively connected with the processor (1); and the infrared emitter (2) and the infrared receiver (3) are arranged at the two ends of a yarn conveying region and are symmetrical. The touch type yarn detector has simple structure and easy operation and can be used to solvethe problems that the existing broken yarn sensor is easy to damage, the maintenance is difficult and the service life is short.