The invention provides a forming method of a radio frequency stealth transmitting beam based on a four-dimensional antenna array. Only simple timing sequence design is needed to achieve similar multiple input multiple output MIMO and phase controlled MIMO arrays and even better detection performance, a radar is different from a traditional radio frequency stealth radar, and good radio frequency stealth performance can be given to the radar due to pseudo-randomness of timing sequence. The invention further provides a forming system of the radio frequency stealth transmitting beam based on the four-dimensional antenna array based on the forming method. The forming system has the characteristics of being simple in structure, and easy to realize. According to the forming method and system of the radio frequency stealth transmitting beam based on the four-dimensional antenna array, the generation condition of four-dimensional antenna timing sequence is controlled, under the condition that aradiation signal with good radio frequency stealth performance is ensured, orthogonality among sub-arrays of transmitting antennas or different radio frequency switches is easily realized, a receiving end receives an echo and carries on the signal processing, and information of multiple targets can be simultaneously obtained.