Elevator balance coefficient detection alarm method and system

The invention relates to an elevator balance coefficient detection alarm method and system. The method comprises the following steps: S1: manually setting the balance point position or carrying out calculation to obtain the balance point position, wherein the balance point position is the position in which the suspension point of the elevator car and the suspension point of the counterpoise are just horizontally symmetrical; S2: when the elevator is idle, automatically starting the detection program or manually starting the detection program according to the previous settings, detecting the torque of the elevator tractor when the idle elevator car descends through the balance point position, and calculating the elevator balance coefficient according to the obtained tractor torque; and S3. comparing the balance coefficient with the preset threshold value, judging whether the balance coefficient is within the preset threshold value, and if not, giving an alarm or/and transmitting the calculated balance coeffici