The invention discloses an electricity stealing prevention system. The system comprises a smart electric meter, a processor and a smartphone terminal, wherein the smart electric meter is used for generating power data and arranged in an electric cabinet, the electric cabinet is provided with an electric cabinet door capable of being opened and closed, and a vibration sensor is arranged on the inner wall of the electric cabinet door; the processor obtains the power data and deduces the electricity utilization habit of a user; the processor monitors the actual electricity utilization conditions every day, and if actual power data in m continuous days is marked, the processor sends first prompt information to the smartphone terminal; when the processor receives a vibration detection signal, second prompt information is sent to the smartphone terminal; if the user does not send confirmation information to the processor within a set time interval, the processor sends the second prompt information to the smartphone terminal every 5-10 minutes till the user sends the confirmation information used for confirming that the electric cabinet door is authorized to be opened. Through the system, timely reminding of a suspended electricity stealing situation is realized.