The invention relates to an air conditioning line vibration control system and method. A vibration sensor used for monitoring vibrational amplitude of a line is disposed on the line between a compressor of an air conditioner and a condenser thereof, a value of the vibrational amplitude of the line is transmitted to an outdoor unit master control panel, and the outdoor unit master control panel adjusts running frequency of the compressor according to the value of the vibrational amplitude. The value of the vibrational amplitude of the line is monitored to control the running frequency of the compressor, the system monitors vibration of the line in real time and auto-adjusts the running frequency of the compressor according to pre-set rules, the influence of other factors upon vibrational frequency is eliminated, the vibration of the line can be effectively controlled in a certain range, effective control of line vibration is achieved, and system reliability is improved.