Hydraulic balance type pilot valve and electronic control fuel injector

The invention provides a hydraulic balance type pilot valve and an electronic control fuel injector. The hydraulic balance type pilot valve comprises a guide body, a valve element and a valve element, the electromagnetic valve assembly can be arranged in an electromagnetic valve cavity formed by the oil sprayer body and the guide body; the armature penetrates through the guide matching hole of the guide body, the armature comprises an armature disc and an armature rod, the armature disc is located in an electromagnetic valve cavity formed by the oil sprayer body and the guide body, and the lower end of the armature rod is located in a high-pressure cavity formed by the guide body and the metering orifice plate; the armature rod comprises a first section and a second section, the radial size of the first section is larger than that of the second section, a first conical surface is arranged between the first section and the second section, and the first section is in clearance fit with the guide hole of the gui