The invention relates to an engine cylinder cover hood, in particular to a sealing ring anti-heating type flat-top cylinder cover structure matched with a camshaft frame. The sealing ring anti-heatingtype flat-top cylinder cover structure comprises a cylinder cover, the cylinder cover hood, the camshaft frame, a camshaft bearing cover, a sealing ring and a rocker shaft bearing seat, all the machining faces of the top surface of the cylinder cover are located on the same plane, the bottom of the side wall of the camshaft frame is inwards provided with an inward concave portion, and the combined position of the inward concave portion and the air cylinder cover is located above the solid portion at the top of an air exhaust port and is close to a water channel in the cylinder cover. Throughthe structure, the height of the cylinder cover is reduced, the weight of the cylinder cover is reduced, and replacement and maintenance of air cylinder cover installation components are facilitated;and the inward concave portion is arranged at the bottom of the camshaft frame, so that the sealing ring is close to the water channel, then good heat dissipation of the sealing ring is realized, andthe structural strength of the camshaft frame is improved through the inward concave structure at the same time.