The invention relates to the technical field of mold production and application, in particular to a mold capable of adjusting elasticity online, which comprises a support, a push plate, a fixed mold plate, a mold core and a mold core cover, the push plate is arranged on the support, the fixed mold plate is arranged on the push plate, the mold core is arranged on the support, the mold core cover is arranged in a mold cavity of the push plate and the fixed mold plate, the mold core penetrates through the push plate to be connected with the mold core cover, the interior of the mold core is of a hollow structure, an elastic mechanism is arranged inside the mold core, an adjusting mechanism matched with the elastic mechanism is arranged on the support, a sprue bush is arranged above the fixed mold plate, one end of the elastic mechanism abuts against the adjusting mechanism, and the other end of the elastic mechanism abuts against the interior of a glue inlet of the sprue bush. According to the mold capable of adjusting the elasticity online, the problem of flow lines on the surface of a product is effectively solved, the application range is wide, the effect is stable, and operation is easy.