Embodiments of the present disclosure relate to a gearbox housing. The gearbox housing has a housing body and an annular gear. The housing body comprises an annular support and a lateral portion provided at a side face of the annular support. The lateral portion has a hole formed thereon for an input shaft to pass through. The annular gear is provided inside of the housing body along a radial direction and adapted to couple to the annular support, wherein a plurality of teeth are circumferentially provided at an inner side of the annular gear. A gear wheel with an output shaft is adapted to couple to the plurality of teeth.