The invention discloses anti-dismounting shipborne electronic equipment and an anti-dismounting method thereof. The equipment includes a shipborne positioning terminal and an anti-dismounting installing support, the shipborne positioning terminal is installed in the anti-dismounting installing support and is provided with a microswitch, a microswitch state detection module, an anti-dismounting alarm signal generation module and a data transmission module, and the anti-dismounting installing support is fixed on an inner wall of a cabin. The method includes the steps of: detecting the state of a microswitch, if the microswitch is in a closed state, generating a low level signal, and if the microswitch is in an upspring state, generating a high level signal; generating anti-dismounting alarm signal data with the generated high level signal, storing the data, packing the data together with satellite positioning data and service state data of a shipowner user and sending the data to a ship positioning monitoring system. The anti-dismounting method provided by the invention can send the acquired anti-dismounting alarm signal data to the ship positioning monitoring system, thereby facilitating real-time supervision of abnormal conditions of the shipborne positioning terminal by customs.