The utility model provides a novel electric experimental polylinker earth connection, including the earthing terminal, earth connection main part, separated time port, earth connection branch, plug, preforming type end accessory, plug -type end accessory, clip type end accessory and couple type end accessory the upper portion of earthing terminal connecting the earth connection main part, the upper portion of earth connection main part set up the separated time port. The utility model discloses an earth connection branch, earthing terminal, preforming type end accessory, plug -type end accessory, the setting of clip type end accessory and couple type end accessory for can choose earthing terminal accessory type according to the model of testing instrument ground connection, reach the purpose that to mate most testing equipment with one set of earth connection, avoid equipment from the phenomenon of taking the earth connection because of using, abuse the interface that appears with and not being inconsistent influence test, convenient to use.