The invention discloses a method for detecting fault satellites of a satellite navigation system, which comprises the steps: all visible satellites are divided into a first satellite subgroup and a seThe invention discloses a method for detecting fault satellites of a satellite navigation system, which comprises the steps: all visible satellites are divided into a first satellite subgroup and a second satellite subgroup according to a satellite top view direction angle in a navigating constellation, and fault detection is carried out on the first satellite subgroup and the second satellite subcond satellite subgroup according to a satellite top view direction angle in a navigating constellation, and fault detection is carried out on the first satellite subgroup and the second satellite subgroup respectively to obtain the fault satellites. The method adopts the technical scheme that all the visible satellites are grouped according to the satellite top view direction angle in the navigatgroup respectively to obtain the fault satellites. The method adopts the technical scheme that all the visible satellites are grouped according to the satellite top view direction angle in the navigating constellation; the satellites with close or approximately reverse satellite top view direction angles are divided into a group according to the geometric distribution characteristic of the satelliing constellation; the satellites with close or approximately reverse satellite top view direction angles are divided into a group according to the geometric distribution characteristic of the satellites; and LSR detection and MLE recognition are carried out on the grouped satellite subgroups respectively . The invention effectively increases the detection speed and the recognition rate of the fautes; and LSR detection and MLE recognition are carried out on the grouped satellite subgroups respectively . The invention effectively increases the detection speed and the recognition rate of the fault satellites, is suitable for double-star detection and single-star detection and can be applied to a multiple-constellation satellite navigation system.lt satellites, is suitable for double-star detection and single-star detection and can be applied to a multiple-constellation satellite navigation system.