The invention provides a folding foam plastic boat with a built-in reinforcing structure and relates to the technical field of water transportation. The folding foam plastic boat with the built-in reinforcing structure comprises a front cabin, a rear cabin, the reinforcing structure, a hinge connecting part, a lock catch connecting part, a propeller base and a propeller energy cabin. The front cabin and the rear cabin are both made of a foam plastic material. The reinforcing structure is arranged in the front cabin and the rear cabin. The hinge connecting part is arranged at the splicing position of the bottom of the front cabin and the bottom of the rear cabin. The lock catch connecting part is arranged at the splicing position of the top of the front cabin and the top of the rear cabin. The propeller base and the propeller energy cabin are both arranged in the rear cabin. The folding foam plastic boat with the built-in reinforcing structure is simple in structure, high in stiffness, large in buoyancy, high in safety, capable of being detachably folded, convenient to transport and store, economical, durable and capable of being well applied to the aquaculture, the fishery and rivers, lakes and seas safely.