The invention provides a special testing device for remote signaling and remote control of a transformer substation. The testing device comprises a shell; a front panel is provided with four-way delay amount LED indicator lights, a pulse width imbedding LED indicator light, a trigger pulse generation key operation LED indictor light, an LED display screen, a power switch, four-way delay amount imbedding keys, a pulse width imbedding key, a trigger pulse generation key, an intrinsic parameter check key, a resetting key and a data preset dial switch; an internal circuit comprises an interface unit module, a first delay setting MPU, a second delay setting MPU, a first pulse width adjustment and management MPU, a second pulse width adjustment MPU, a third pulse width adjustment MPU, a fourth pulse width adjustment MPU, a solid-state relay interface unit, an OC gate interface unit, an idle contact interface unit and a TTL output interface unit. The testing device is used for adjusting pulse widths of telecontrol signals and loop signals of the transformer substation through simulation and achieving pulse delay control.