SCR system fault diagnosis method and device, electronic equipment and storage medium

The invention relates to the technical field of diesel engines, in particular to an SCR system fault diagnosis method and device, electronic equipment and a storage medium, the method comprises the steps that a current parameter set of an engine is obtained, and the current parameter set comprises upstream and downstream detection information in gas exhausted by a selective catalytic reduction SCR system; determining whether the engine reaches a stable working state or not according to the detection information in the current parameter group; if yes, delay waiting time is obtained, the conversion efficiency of the SCR system is calculated after the delay waiting time, and whether the SCR system breaks down or not is determined through the conversion efficiency. Therefore, the accuracy of fault diagnosis of the SCR system can be improved, the risk of false report is reduced, the service cost can be further reduced, and the comprehensive economic benefit is improved. 本申请涉及柴油机技术领域，尤其涉及一种SCR系统故障诊断方法、装置、电子设备及存储介质，