The invention discloses a horizontal injection press which comprises a working table, an injection molding mechanism, a fixed pressing plate, a movable pressing plate, a formwork plate, a horizontal driving mechanism, a guide rail and a plurality of guide columns; the movable pressing plate and the formwork plate slide in the extending direction of the guide columns, and the horizontal driving mechanism comprises a sliding table, a first transmission belt, a second transmission belt, a first connecting rod, a second connecting rod, a first main shaft nut, a second main shaft nut, a first driven belt wheel, a bearing plate, at least one driving motor, a driving sliding wheel, a first main shaft with an external thread and a second main shaft with an external thread; and the bearing plate and the driving motor are fixedly arranged on the working table, and the sliding table is arranged on the guide rail in a horizontally-sliding manner. The horizontal injection press is simple in structure and low in cost, the die opening and closing accuracy is high, multiple dies can be subject to injection molding through one-time injection molding operation, the injection molding efficiency is high, and the injection molding quality is good.