The invention discloses an anti-theft anti-shielding alarm system for a power tower, which comprises an alarm host, a solar battery pack, a three-technology waterproof detector, a video monitoring camera, an alarm signal, a transmission system, a monitoring host, a storage server and a printer, wherein a shock sensor is installed at the tower foot, the front end also comprises an inverted signal shielding module, the inverted signal shielding module comprises a singlechip, a signal amplifier, a signal detector and a superpower signal transmitter, a signal detection and alarm device is installed at the monitoring center and can give alarm information if no signal is received within set time, and the transmission system adopts the transmission mode of combining wireless 3G network transmission and GSM transmission. In the invention, the inverted signal shielding function is added, so that a thief can be prevented from finding opportunities to steal by shielding alarm transmission signals, the security and the stability of the system are increased, and the two-channel transmission is convenient for management.