The utility model discloses a molding mould for a hollow filament in the production process of the plastic elastic cushion with the hollow filament, which comprises a mould body. A melted material flowing channel is arranged in the mould body. The mould body is provided with a plurality of filament discharging holes which are communicated with the melted material flowing channel and located belowthe melted material flowing channel. A gas channel connected with a gas supplying device is arranged above the melted material flowing channel arranged on the mould body, and an air pipeline is fixedon the mould body between the gas channel and the melted material flowing channel. The inner cavity of the air pipeline is communicated with the gas channel; and the air pipeline penetrates through the melted material flowing channel and is located in the filament discharging hole. A filament tube product shaping chamber which is communicated with the melted material flowing channel is formed between the air pipeline and the filament discharging hole. The molding mould can be utilized to produce the hollow plastic filament (a filament tube), and the elastic cushion formed by the hollow plasticfilament greatly decreases the weight per unit volume of the product; and therefore, the material is saved, the movement and transportation are convenient and the strength of the product is improvedat the same time.