The invention discloses a spacecraft multi-target heuristic ordering task planning method and belongs to the technical field of aerospace. The method describes the composition, the resources, the subsystem functions and various constraint conditions required to be satisfied of a spacecraft according to subsystem internal constraint characteristics and in consideration of spacecraft structure, taskrequirements, equipment status and spacecraft capabilities, in view of the complex constraint of the spacecraft system and the coupling of system state information, describes multiple parallel subsystems of the spacecraft by using a timeline, establishes the internal state transition diagram of the subsystem, performs multi-target heuristic ordering task planning according to the constraint information and the state transition diagram between tasks, determines the orders of the tasks according to the symbol of an evaluation value, guides a planning search direction according to a multi-targetheuristic ordering result, finally outputs a multi-target heuristic ordering task planning solution, that is completes task planning of the spacecraft, reduces search space and improves the efficiency of task planning.