An oil collection and forced lubrication structure of a model engine has an oil-collecting groove provided at a circumferential wall of a passageway of a crankshaft body. The oil-collecting groove is disposed with a lubrication hole extending to pass through a projecting shaft of the crankshaft body. Thus, when oil gas gets into the passageway of the crankshaft body, the oil gas will be cast by the centrifugal force produced by rotation of the crankshaft body and attached on the circumferential wall of the passageway to be collected and pre-stored in the oil-collecting groove. Then, the oil gas will be cast to the outer circumference of the projecting shaft via the lubrication hole to produce forced lubrication effect between the projecting shaft and a piston rod, thus enhancing lubrication effect, enabling the crankshaft to rotate smoothly and elevating engine efficiency.