The invention provides a method for identifying pulse optical signal, including: a. receiving first trigger information; b. collecting and identifying pulse optical signal with a predetermined method to obtain a unit of data; c. parsing the unit of data and determining type of it, if the unit of data is a unit of data representing header information, step d is executed; or if the unit of data is other type of unit of data, step b is executed; d. going on collecting and identifying pulse optical signal with the predetermined method to obtain a unit of data; e. determining whether all units of data corresponding to the unit of data representing the header information is received; f. packeting the unit of data representing the header information with all corresponding units of data into a group of data packets. The invention converts the pulse optical signal into bits, packets and converts the bits into a data packet, and receives the photosensitive-transfer information which accelerates the process of obtaining required data by a signal identifying device.