The invention provides a device for automatically bending glass. The device comprises a support A and a support B, wherein a plurality of rollers are rotationally connected between the support A and the support B, and the support A is provided with a watering device and a heat gun; one side of the support A is provided with a plate seat, one side of the plate seat is provided with a lifting board,the lifting board is driven by a motor A to move up and down, a translation plate is driven by a motor B to move left and right, and the bottom of the translation plate is provided with a plurality of sucking assemblies; one side of the support A is provided with a bending die, the bending die comprises an upper die block and a lower die box which are internally provided with solenoid coils, certain sides of the upper die block and the lower die box are respectively provided with a concave surface forming surface and a convex surface forming part, one side of the lower die box is provided with a lifting seat, the upper die block is driven by an air cylinder to move up and down, the convex surface forming part is provided with a plurality of elastic supporting pieces, and each elastic supporting piece comprises a spring B and a supporting rod. Cleaning, drying and preheating operations are performed before the glass is bent, the die heating efficiency is high, and the glass bending quality is high.