Provided is a multifunctional group metal corrosion inhibitor, as shown in one or more of formula (I-a) to formula (I-c). The metal corrosion inhibitor disclosure is a multifunctional group metal corrosion inhibitor comprising Schiff base or a derivative structure thereof, a catechol group and a mercapto group. A plurality of active functional groups are introduced, so that the active adsorption site of the inhibitor can be increased, and the synergetic effect of the three functional groups can enhance the adsorption effect of the inhibitor and a metal, And thus, the inhibitor is suitable for applicable for adsorptions of plurality of metals. Therefore, the inhibitor can exert a high anti-corrosion efficiency under the condition of a low addition amount, and provides a protection effect for the plurality of the metals.

##STR00001##

Provided is a multifunctional group metal corrosion inhibitor, as shown in one or more of formula (I-a) to formula (I-c). The metal corrosion inhibitor disclosure is a multifunctional group metal corrosion inhibitor comprising Schiff base or a derivative structure thereof, a catechol group and a mercapto group. A plurality of active functional groups are introduced, so that the active adsorption site of the inhibitor can be increased, and the synergetic effect of the three functional groups can enhance the adsorption effect of the inhibitor and a metal, And thus, the inhibitor is suitable for applicable for adsorptions of plurality of metals. Therefore, the inhibitor can exert a high anti-corrosion efficiency under the condition of a low addition amount, and provides a protection effect for the plurality of the metals.

##STR00001##