The invention provides a continuous preparation method for benzylzinc halide and a derivative thereof. The continuous preparation method uses a continuous reactor for reaction of direct inserting a zinc atom into a carbon-halogen bond, wherein the continuous reactor comprises a heating section and a cooling section that are connected to each other, the cooling section is located above the heating section, and the cooling section has a product overflow port, the continuous preparation method comprising: respectively continuously feeding a liquid reaction material and a zinc powder to the heating section, the zinc powder being continuously fed into the heating section from an over part of the heating section, the liquid reaction material being fed into the heating section from a lower part of the heating section, subjecting same to a direct the zinc atom insert into carbon-halogen bond reaction to obtain a product system, and allowing the product system to discharge from the continuous reactor via the product overflow port, wherein the liquid reaction materials comprise a halide, and the halide has structural formula I

According to the continuous preparation method, zinc powder does not accumulate in the continuous reactor, thus avoiding the risk of spraying material and facilitating the application of the continuous preparation method in large-scale production.