The embodiment of the invention provides a method and device for allocating an access point in a visible light wireless communication system, relates to the field of visible light wireless communication, and can avoid network interruption and time delay from being caused by switching of an access point during movement of a user. The method comprises the following steps: obtaining the coverage areaof an access point; determining a part in the coverage area of the access point that does not overlap with the coverage areas of other access points to be an independent coverage area, and determining a part in the coverage area of the access point that overlaps with the coverage areas of other access points to be a mixed coverage area; putting the total data flow of the independent coverage areato be under the responsibility of the corresponding access point; according to signal attribute parameters of the access points corresponding to the mixed coverage area in each position, allocating the total data flow to the access points corresponding to the mixed coverage area; formulating an access point allocation table based on allocation results of all coverage areas; allocating the total data flow of a user terminal according to the location information of the user terminal and the access point allocation table.