The invention discloses an anti-toppling mechanical device and method for an internal suspension stay wire holding pole. The anti-toppling mechanical device mainly comprises a triggering mechanism and an anti-toppling mechanism, the triggering mechanism comprises a triggering box, the triggering box is installed on the holding pole, a channel is formed in the triggering box, the middle of the channel is low, the outer side of the channel is high, a triggering ball is installed at the low position of the channel, a groove is formed in the high end of the channel, a pressure sensor is arranged in the groove, the anti-toppling mechanism comprises a plurality of supports, the upper portion of each support is hinged to a longitudinal beam of the holding pole, a first electromagnet and a second electromagnet are installed on the lower portion of each support, When each first electromagnet is powered on and the corresponding second electromagnet is powered off, the first electromagnet and the holding pole are attracted and fixed, and when each first electromagnet is powered off and the corresponding second electromagnet is powered on, strong springs unfold the supports to abut against an iron tower. According to the anti-toppling mechanical device and method for the internal suspension stay wire holding pole, the internal suspension stay wire holding pole is prevented from toppling, it is guaranteed that a tower body is not damaged, and constructors are not injured.