The invention relates to a handheld check and alarm device for preventing high-tech power stealing, comprising a power stealing remote control part, a strong-magnetic-field power stealing detection part, and a power supply. The power stealing remote control part is composed of a single chip microcomputer, a liquid crystal display, a wireless receiving module, and a first buzzer alarm. The strong-magnetic-field power stealing detection part is composed of a GPRS module, a magnetic field detection module, alarm type indicator lamps, and a second buzzer alarm. The power supply is connected with the single chip microcomputer, the liquid crystal display, the GPRS module and the magnetic field detection module. The device is efficient, small and easy to carry. The device mainly aims at courts and suspected stolen users with high line loss and power stealing check difficulty, and can be used in daily inspection at any time.