Airframe of four-rotor aircraft

The utility model belongs to the field of aircrafts and particularly relates to an airframe of a four-rotor aircraft. The airframe comprises a control circuit board installation groove and four propeller protective grooves, a power supply installation groove is further formed in the circuit board installation groove, and the four propeller protective grooves are respectively communicated with the control circuit board through a motor support installation groove. At least one landing shock-absorption body is further arranged at the lower portion of the airframe. The landing shock-absorption body is a hemispheroid. The landing shock-absorption body is made of soft elastic materials. Due to arrangement of the propeller protective grooves and the landing shock-absorption body, the four-rotor aircraft can effectively eliminate damage to a propeller when the four-rotor aircraft flies and is crashed by an obstacle and harm to the airframe when the four-rotor aircraft lands, and the service life of the four-rotor aircraft is prolonged.