Protection method of split type cash side cabinet

The invention discloses a protection method of a split type cash side cabinet. A main cabinet and the side cabinet are included; a signal sending module is disposed in the main cabinet; a signal receiving module and an intelligent power source module are disposed in the side cabinet; the signal sending module sends signals with a certain frequency to the signal receiving module; the signal receiving module controls the intelligent power source module to run according to the received signals; the intelligent power source module comprises a signal analysis module, a control module, a control switch and a power source; and the signal analysis module judges whether signal connection of the main cabinet and the side cabinet is normal or not through signals which are fed back by the signal receiving module, and meanwhile corresponding commands are sent to the control module. The main cabinet can monitor the state of the side cabinet in real time; and after communication between the side cabinet and the main cabinet