Compact rhombic composite wing aircraft

The compact rhombic composite wing aircraft comprises a fuselage, and the fuselage is sequentially provided with a front wing, a thrust duct and an empennage from the front part to the rear part; the two thrust ducts are symmetrically arranged on the two sides of the fuselage, the empennage is arranged on the rear portion of the fuselage in a protruding mode, and a rear wing is arranged on the top of the empennage. Wingtips at the left end and the right end of the front wing are connected with wingtips at the left end and the right end of the rear wing through connecting wings, and a plurality of lift fans capable of providing lift force in the vertical direction are arranged on the front wing and the rear wing respectively; the front wing, the rear wing and the two connecting wings jointly form a rhombic composite wing; and the thrust duct can do tilting motion relative to the fuselage so as to switch between a vertical take-off and landing mode and a level flight cruising mode. According to the scheme, the