The invention discloses a pilotless helicopter, comprising a main rotor system, a swash plate device, a drive system, a starting device, an engine, a body frame, a tail rotor device, a landing device and at least one auxiliary lift, anti-twisting force and cooling functional device, wherein the auxiliary lift, anti-twisting force and cooling functional device comprises ducts and a lift fan, the lift fan is annularly embraced in the ducts, and the ducts are arranged symmetrical about a central axis which is the advancing direction of the pilotless helicopter; the ducts are fixed above the engine, and an air guide passage is designed below the ducts and guides air to a cylinder of the engine; and the swash plate device is a four-channel hybrid control swash plate device. A part of additional lift and anti-twisting force are provided for the pilotless helicopter by using the power of the cooling engine, so that the pilotless helicopter has larger effective load and higher efficiency. Four steering engines of the four-channel hybrid control swash plate device are arranged in a manner of backing up each other, so that the stability is improved.