The invention discloses a hollow fiber composite membrane forming device. The hollow fiber composite membrane forming device comprises a membrane forming liquid device, a metering pump, a spray coating device, a traction device and a hollow rope, wherein the membrane forming liquid device accommodates membrane forming liquid; one end of the metering pump is connected with the membrane forming liquid device through a pipe; the spray coating device is connected with the other end of the metering pump through a pipe; the spray coating device is an annular sleeve; micropores are formed in the inner surface of the sleeve; one end of the hollow rope runs through the annular sleeve and is connected with the traction device. Through improvement on a coating process, a product has good adhesion and flexibility, the tensile strength of a membrane is as high as 300N, and the peel strength of the membrane surface can be 10kg or higher, so that the problem of filament breakage is completely avoided; because of good adhesion, the membrane surface is not peeled off in the aerating process, so that development of surface damage is effectively inhibited, rupture of membrane filaments is avoided and the using safety of the membrane filaments is improved; therefore, the hollow fiber composite membrane forming device can be widely applied to the field of water recycle.