The invention belongs to a glue injection machine for unsaturated polyester resin glass fiber reinforced plastic production and a process. The machine comprises a yarn frame, the tail end of the yarn frame is sequentially connected with a pre-forming device, a glue injection box and a mold, a heating board is arranged on the outer surface of the mold, a glue injection inlet is formed in the top of the glue injection box, the glue injection inlet is connected with a glue production device, an excess material outlet is formed in the bottom of the glue injection box, and is connected with a stirring tank in the glue production device, and the glue production device comprises the stirring tank; an excess material flow back opening, a resin inlet, a padding inlet, a curing agent inlet and a compression air inlet are formed in the top of the stirring tank, a stirrer and a filter net are arranged in the stirring tank, a glue outlet is formed in the bottom of the stirring tank, and the excess material flow back opening is connected with the excess material outlet of the glue injection box through a first pneumatic two-way valve. The glue injection machine has the beneficial effects that the structure is simple, design is reasonable, operation is convenient, the phenomena that traditional opening gum dipping hurts human body health, and the environment is polluted are avoided, the excess materials can be effectively recycled, and the product quality is improved.