Multi-channel free parallel control method and system

The invention discloses a multi-channel free parallel control method and system, and the method comprises the steps: an upper computer issues a parallel operation instruction of parallel operation of this time, and after receiving the parallel operation instruction, a host requests each slave to feed back a state bit of the slave, an updated status bit is calculated according to the parallel connection mode, the status bit of the slave computer and the status bit fed back by the slave computer, and the updated status bit is shared to each slave computer; during parallel connection, the upper computer only needs to issue a parallel operation instruction to the host, and the number of instructions sent by the middle computer to channel parallel connection operation is effectively reduced; after the host receives the parallel operation instruction, the updated status bit is shared to each slave, and the host and each slave can determine information of channels connected with the host and each slave in parallel b