The invention discloses a collection method for epoxy propane gas generated during the ship-loading operation. According to the method, a nitrogen gas supply cylinder inputs nitrogen gas into a nitrogen gas branch pipeline, the nitrogen gas enters a main collection pipeline from a nitrogen gas port and fills the whole main collection pipeline, and therefore the oxygen content in the main collection pipeline is lower than 0.5%; a butterfly valve is opened, the epoxy propane gas collected in a ship hull enters the main collection pipeline through a hose, and a first pressure transmitter and a second pressure transmitter transmit signals to a PLC control system; a first oxygen content analysis instrument and a second oxygen content analysis instrument measure the oxygen content, a differential pressure transmitter is used for measuring the value of the pressure difference at the two ends of a filter, a first temperature transmitter and a second temperature transmitter are used for measuring the value of the temperature difference at the two ends of a flame arrester, and then whether a collection device needs to be started can be determined according to the values. According to the invention, the oxygen content of the epoxy propane gas does not exceed the standard in the conveying process, other potential safety hazards can be eliminated, and the epoxy propane gas can be effectively conveyed to an epoxy propane recovery device at the rear end.