The invention discloses an adaptive spare power automatic switching intertripping device based on a substation measurement and control digital quantity. The adaptive spare power automatic switching intertripping device acquires each bus feeder current value on a low-voltage side in a substation from an integrated automatic communication management device through a 104 protocol and an Ethernet interface, stores the bus feeder current values into a database, and is connected with a spare power automatic switching device through the Ethernet 104 protocol or performs serial port communication with the spare power automatic switching device to acquire the information of the spare power automatic switching device. The adaptive spare power automatic switching intertripping device has a rational structure, acquires each switching current value and switch on/off position signals in an integrated automatic system of the substation in a communication way, can perform integrated computation and logic judgment according to real-time load current data immediately after spare power automatic switching operation on the low-voltage side in a main transformer, and remotely controls the selective tripping of an outlet switch in the communication way to ensure the safety running of the main transformer which is normally supplied with power, thereby avoiding a substation full-stop accident caused by the overload of the main transformer.