The invention discloses a key travel testing device. The device is provided with a base. A bracket is fixed on the base. The bracket comprises two slide rods which are parallelly fixed. A push rod is arranged between the slide rods. A conductive indication piece is arranged on the push rod. The indication piece is provided with two extending parts which are in close contact with two slide rods. Test areas are arranged at symmetrical positions of two slide rods. One slide rod is an insulating rod, and the test area is a conductive part. The other slide rod is a conductive rod, and the test area is an insulating part. Two poles of a power supply are connected with the conductive slide rod or the conductive test area through the indication piece to form two test circuits. Two test circuits are connected in series with an indication light. The key travel testing device provided by the invention has the advantages of simple structure, easy production, low cost and being portable, and can quickly carry out key travel testing. The working efficiency is greatly improved.