The utility model discloses a flat rudder face angle measuring device of aircraft, including the arch piece, compasses sword sucking disc, the connection piece, thin head rivet, the straight -flanked ring, the bandage, plastics tri glide button, the cushion, horizontal angle sensor, vertical angle sensor and wire, the inside at compasses sword sucking disc is fixed to horizontal angle sensor level, the inside of compasses sword sucking disc still is equipped with the fixed plate of vertical direction installation, vertical angle sensor is vertical to be installed on the fixed plate, the connection piece is fixed on the up end of compasses sword sucking disc, straight -flanked ring one end is passed through thin head rivet and is installed on the connection piece, the one end suit of bandage is on the other end of straight -flanked ring, plastics tri glide button install on the bandage, the inside at compasses sword sucking disc is installed to the cushion. The utility model has the advantages of structural design is reasonable, space utilization is high, convenient to use, the quality is light, and the size is little, is convenient for deposit, transports and uses, and loading and unloading are convenient, has effectively solved the problem of the fixed difficulty of sensor installation, has realized the measurement of angle.