The invention discloses a high-speed water lubrication dynamic pressure spiral groove bearing electric spindle. The spindle comprises a shaft neck, a radial bearing bush, a thrust disc, a thrust bearing bush, a spindle body, a gas injection sealing ring, a motor stator, a motor rotor, a cooling water jacket, a shell and peripheral equipment. Water serves as lubricant of a radial (thrust) bearing,spiral grooves are engraved in the shaft neck and in the thrust disc, and an anti-drag micro-textures are machined in a table area; the radial (thrust) bearing bush is made of special carbon graphite,and a Ta-Si-based nano composite coating is prepared on the surface of the neck shaft (thrust disc); the spindle body adopts dynamic pressure spiral groove radial supporting and thrust bearing mixingsupporting, the special non-contact gas injection sealing ring is designed at the ends of the bearings, and the spindle body is driven by a rare earth permanent magnet brushless direct current motor;and the motor stator is cooled through the cooling water jacket. The spindle has the advantages that the temperature rise of the bearings is low, the friction power consumption is low, the rotation precision is high, the stability is good, the cavitation erosion resistance is high, pollution is avoided, and the spindle is particularly suitable for a high-speed precision machining machine tool.