The invention discloses a detection alarm device for preventing the power transmission of a transformer station with security measures. According to the invention, the occurrence of malignant accidents during the power transmission with security measures can be prevented. When an operator restores the operation of power failure equipment, the operator needs to remove all installed security measures firstly. According to the invention, the grounding wire of the device is temporarily arranged between the power failure equipment and the grounding grid of the transformer station. If a security measure is still arranged in a power transmission device, a conduction loop is formed to trigger an alarm device. In this way, the operator is warned to stop the power transmission. Compared with the traditional method, the device of the invention is ingenious in concept, simple, convenient and easy to use, safe and reliable. Meanwhile, through the voltage dispersion and charge release manner, the voltage withstanding problem of the device when the device is in direct contact with the power failure equipment can be solved.