The invention discloses a tooth surface treatment method and a tooth surface treatment device based on a plasma technique. The device comprises a gas storage container, a plasma generator, a power supply and a spray gun, wherein the gas storage container is used for containing a working gas; the plasma generator is used for receiving the working gas from the gas storage container and used for outputting plasma flow after the working gas is subjected to plasma treatment; the power supply is used for supplying power to the plasma generator; the spray gun is communicated with the plasma generator and is used for applying the plasma flow to the surface of a tooth. According to the tooth surface treatment method and the tooth surface treatment device based on the plasma technique, the low-temperature acid etching plasma flow is utilized, the security and the comfort are improved, secondary pollution of diffusate is avoided, the stain on the surface of the tooth can be removed, an etching effect is achieved, and thus the bonding strength of the tooth with a support groove or a mounting material is improved.