The invention discloses a standby task scheduling method of an embedded operating system, which comprises the following steps of: 1, expressing a task ready table by eight bits of one byte, dividing auser task into eight priorities from 1 to 8 in one-to-one correspondence with the bits of the byte from low to high, and setting the priority of an idle task of the system to be 0; 2, triggering a system response by an event, activating the task with the highest priority in the task suspension table by the system, judging whether the priority is lower than the priority of the currently executed task, and if yes, executing the step 2 to wait for the triggering of the next event; otherwise, suspending the currently executed task, and executing the step 3; 3, inquiring a task ready table by thesystem scheduling program, and scheduling a ready task with the highest priority to run according to a task number formed by bytes to which the task ready table belongs; and step 4, completing the scheduling of the corresponding task and executing the step 2. According to the method, the idle tasks do not occupy byte bits of the task ready table independently, the expenditure of a system on hardware memory resources is reduced, and the cost is reduced.