The invention discloses an automatic coil changing device for a multi-axial glass fiber warp knitting machine. The automatic coil changing device mainly consists of a lifting type automatic shaft supporting device, a lifting type air expansion shaft automatic clamping device and an automatic coil pushing device, the lifting type automatic shaft supporting device can support an air expansion shaft,the lifting type air expansion shaft automatic clamping device can clamp the air expansion shaft and move from left to right, and the automatic coil pushing device realizes the coil discharging and feeding work of a paper tube. Compared with the prior art, the automatic coil changing device has the following advantages that the workload of operators is reduced, the production efficiency is improved, operation is easy and convenient, and safety performance is high.