The utility model belongs to a vehicle cleaning device, in particular relates to a telescopic windscreen wiper used on an automobile rearview mirror. The telescopic windscreen wiper comprises a wiper device, a power unit, and a connecting device connected with the rearview mirror. The device is characterized in that the wiper device comprises a telescopic link 1 and a leader 3; the telescopic link 1 is sleeved in the leader 3 and is connected with the leader 3 in a slippage way; one side of the telescopic link 1 is axially connected with a row of wipers 2; a groove 4 is arranged on the leader 3 and is connected with the wipers 2 correspondingly; one row or two rows of the wipers 2 are axially connected with one side or two sides of the groove 4. After the telescopic windscreen wiper is connected with the rearview mirror, the wipers can rotate back and forth, leftwards and rightwards move back and forth, and upwards and downwards move back and forth, so as to ensure the well cleaning and convenient concealment when being taken back. The telescopic windscreen wiper can ensure the clear backsight under any weather conditions, and provide guarantee to safe driving.