The utility model provides an ultrasonic remote detection device for cracks on a high-voltage insulation ceramic bottle of a power transmission line. The ultrasonic remote detection device is characterized by comprising a laser ultrasonic detector computer control center (101) which is respectively sequentially and electrically connected with a pulse laser device (102), a two-shaft electric small mirror (103), a laser vibration measurement instrument (104), a high-speed A/D (Analogue/Digital) converter (1-5) and a filter amplifier (106) through control lines, wherein the two-shaft electric small mirror is placed on a laser outgoing opening of the pulse laser device. The device disclosed by the utility model can remotely detect cracks on the ceramic bottle online in a safe and quick manner from a long distance and the working state of a ceramic bottle is not influenced.