The invention discloses an anti-interference alarm for vehicles, comprising an antenna outside a casing, a work indicating lamp, a
signal strength display window, a power supply switch, a sensitivity button, a mode adjustment button, a charge networking interface and a charge indicating lamp which are electrically connected with an electric circuit board in the casing. The alarm is characterized in that an electric circuit board is provided with a
control circuit, an alarm networking interface circuit, a
signal strength display circuit, an interference
signal receiving circuit, a work indicating circuit and a charge indicating circuit; the alarm networking interface circuit, the
signal strength display circuit and the interference signal receiving circuit are connected with the
control circuit respectively; and the electric circuit board is also provided with a power supply circuit and a wiring terminal J1 which are connected with the circuits. By the anti-interference alarm, the
mobile phone shaped appearance structure for the
monitor equipment can be realized, the portability of the equipment is greatly improved; and compared with the conventional
monitor equipment, and the accuracy of the
identification rate for signal identification is improved by over 30 percent. By adopting the mode of wired and
wireless blend networking, the detection distance and the detection range of a
system to the interference signal are greatly improved, and the position of the interference source can be accurately provided.