The invention relates to a side board structure of a drawer sliding rail. The side board structure is composed of a metal side board and the sliding rail for opening and closing a drawer, wherein a front connector and a rear connector are fixedly arranged at connecting parts of a front panel and a rear panel of the metal side board, respectively, the metal side board is fixedly connected with a side board support frame through a riveting, touch welding, buckling or adhering method, a connector is arranged on the bottom of the metal side board, and the two sides of the side board support frame and the connector on the bottom of the metal side board are fixed to a movable sliding rail part of the sliding rail through the riveting, touch welding, buckling or adhering method. The side board structure has the beneficial effects that metal side board is in the contact state at least under the load-bearing state of the drawer, meanwhile, through a bending part, for the metal side board, the force generated at least under the load bearing state of the drawer acts to the side board support frame, thus the integral strength of the metal side board is improved, and the load-bearing capacity is enhanced; the thickness of the side board is reduced, thus the use space of the drawer is increased, the transportation and storage are convenient, and the manufacturing cost is reduced; and the service life of the drawer is prolonged.