Helicopter main speed reducer fixing device

The invention relates to the technical field of helicopter main speed reducer assembly, in particular to a helicopter main speed reducer fixing device which comprises a device base, a supporting rod mounting seat base, a supporting rod mounting seat, an adjustable supporting rod, a supporting bottom plate and a supporting base. Four supporting rod mounting seat bases are arranged at the four corners of the upper end face of the device base correspondingly, each supporting rod mounting seat base is provided with a supporting rod mounting seat, and each supporting rod mounting seat is connected with one end of an adjustable supporting rod. The four adjustable supporting rods are connected with the supporting plate on the upper portion of the main speed reducer, the length and angle of the supporting rods are adjusted through threads of the adjustable supporting rods, the main speed reducer is tensioned, the main speed reducer is prevented from toppling over, the main speed reducer is rotated by the two pressing