The invention discloses a silanization pretreatment process for a sintered epoxy powder coating on steel plate surface and belongs to the field of steel plates with sintered epoxy powder coatings. Byadding epoxy powder containing the same components with those of the sintered epoxy powder coating to a silane hydrolysate, binding force between the sintered epoxy powder coating and a steel plate isincreased, and adhesion and durability of the coating are enhanced. With the adoption of the novel silanization pretreatment process for the sintered epoxy powder coating on the steel plate surface,adhesion of the sintered epoxy powder coating on the steel plate surface can be improved remarkably, and durability of the steel plate with the sintered epoxy powder coating in a severe environment isenhanced.