The invention relates to a method and a system for acquiring and querying bus information. The method comprises the following steps that: 1, when each bus runs to a bus stop every time, on-vehicle equipment of the bus sends a line number, a bus serial number, a current arrival stop and an arrival time of the bus to a bus information processing center; 2, after a fixed time interval each time, the bus information processing center determines the bus which sends the information according to the line number and the bus serial number, and distributes line numbers, bus serial numbers, current arrival stops and arrival times of all buses to user equipment; and 3, after receiving a query request, the user equipment displays the line number, and / or the bus serial number, and / or the current arrival stop and / or the arrival time of a corresponding bus according to the query request. By the method and the system, the cost of bus management is reduced, and the bus information is brought into full play to provide service for bus management personnel and the majority of bus passengers.