The invention discloses a transformer iron core grounding wireless program-controlled sampling device. The device comprises a DC 24V power supply, a wireless program-controlled module, a micro-currenttransformer, an FPGA sampling module, and a wireless emission module. The sampling device disclosed by the invention is advanced in technology and strong in practicability; the micro-current transformer can be used for performing wireless program-controlled high-speed sampling on a transformer iron core grounding electric signal, and a background unit studies and judges a grounding state of the transformer iron core through waveform characteristic analysis, and the effect is obvious. The sampling device disclosed by the invention is simple to install and good in generalization and applicationprospect; by adopting the wireless program-controlling and wireless data chain communication technology, an operation of laying the dedicated control and communication cable is unnecessary, the installation is simple and easy, and the sampling device is easy to generalize and apply.