The invention discloses an ultrahigh voltage protection multifunctional and integrated device. The ultrahigh voltage protection multifunctional and integrated device comprises a bus backboard, wherein an analog quantity gathering module, an ADC (analog to digital converter) module, a main CPU (central processing unit) module, a first input module, an SV (safety valve) module, a GOOSE module, a first process level light module, a second process level light module, an input and output module and an operation plug-in module are inserted into the bus backboard, the ADC module and the first input module are both connected with the main CPU module, the second process level light module, the input and output module and the operation plug-in module are all connected with the main CPU module through an output array, the second process level light module is further connected with the GOOSE module, an input end of the ADC module is connected with the analog quantity gathering module, and furthermore an output end of the ADC module is connected with the first process level light module and the SV module. The ultrahigh voltage protection multifunctional and integrated device combines original functions of a combination unit, an intelligent terminal and a line protection device into the same device, and thereby avoids external wiring, improves function reliability, reduces the land occupation area of a transformer substation after the combination unit, the intelligent terminal and the line protection device are integrated, and reduces construction investment costs of the transformer substation.