The present disclosure relates to a method and a device for IP address allocation and topology management in a DAS system, and a readable storage medium. The method for IP address allocation and topology management in a DAS system comprises: configuring a port number for a communication port of a host; allocating an address number and one or more port numbers to a first-level slave according to a port number of the host; allocating an address number and one or more port numbers to a next-level slave according to a port number of a previous-level slave; and determining an IP address of a corresponding slave according to a network segment number of the host and the address number of the slave.