The invention discloses a satellite-loaded SAR specified latitude area echo simulation method, which comprises the following steps of: 1, performing spatial geometry relationship modeling on the satellite-loaded SAR; 2, acquiring satellite-loaded SAR echo simulation parameters through the given wave level parameter table; 3, acquiring a geocentric angle and a middle parameter K; 4, acquiring an angle gamma 1, an angle gamma 2, an ascending node argument u, a real argument of periapsis f, an eccentric angle E and an average argument of periapsis phi; 5, determining the initial time t1 of the echo simulation; 6, determining the finish time t2 of the echo simulation; and 7, performing the satellite-loaded SAR echo simulation according to the initial time t1 and the finish time t2 of the echo simulation. The satellite-loaded SAR specified latitude area echo simulation method has the advantages of high precision, strong practicality, low redundancy of the acquired simulation data, high intuition, and the like.