The invention relates to a novel engine installing structure and belongs to the technical field of airplane design. An engine structural-steel framework area is provided with upper supports and lower supports. The rear end of an engine is fixed to a structural-steel frame through the supports. The two sides of the engine are fixed on a steel pipe I and a fuselage frame through standard belts. Upper girders on the two sides of a fuselage are each provided with one upper support. The upper end of the engine is fixed to a fuselage frame II and a steel pipe II through standard belts. Lower girders on the two sides of the fuselage are each provided with one lower support. The lower end of the engine is fixed to a steel pipe III and a fuselage frame III through standard belts. The novel engine installing structure is applied to low-speed airplanes such as a general-purpose airplane and an agriculture and forestry airplane, and has the advantages of being simple in structure, low in manufacturing cost, good in maintenance performance and the like.