The invention provides a universal projector monitoring method based on an SNMP. A public supporting platform, a cloud device and a projector need to be provided, the projector carries out data interaction with the cloud device through a serial port, and the cloud device interacts with the public supporting platform through the SNMP. The method comprises the following steps: self defining a group of OIDs in the SNMP for uniquely identifying test items; creating a management information base MIB file, defining the test items corresponding to the defined OIDs, so that the test items can be inquired and set by a management process; creating a dynamic base of the accessed projector, carrying out one-to-one correspondence on the test items of the projector according to the MIB file with the OIDs, so that each test item corresponds a specific OID; sending an OID editing instruction to the cloud device by the public supporting platform according to the test items of the projector, and forwarding the OID editing instruction to the projector by the cloud device; and carrying out a corresponding operation by the projector according to the instruction, and sending an execution result to the public supporting platform. By adopting the universal projector monitoring method provided by the invention, the compatibility and universality of the system are improved, and unified management is facilitated.