The invention provides a block chain-based asset settlement method, system and device and a storage medium. The method comprises the following steps of: calling an intelligent contract of a block chain platform to initiate a settlement request by an initiator so as to obtain a settlement round; writing transaction abstract information list which can be settled before a time point Ta into settlement round state information by a participator; generating a settlement plan by the initiator according to the transaction abstract information list, which can be settlement, of the initiator and the participator; calling the intelligent contract of the block chain platform to update and record account information of the initiator and the participator by a supervisor according to the settlement plan;and closing the settlement round by the initiator. According to the method, a time point synchronization-based distributed settlement algorithm is put forward under a block chain framework, so that multiple nodes can initiate and process settlement requests in real time in the presence of multiple participators, and a user service quality protocol can be considered to ensure that the settlement process ensures the service quality protocol without breaking contracts.