SCR system ammonia leakage detection method and device, electronic equipment and storage medium

The invention discloses a detection method and device for ammonia leakage of an SCR system, electronic equipment and a storage medium, and belongs to the technical field of automobiles. When the current operation working condition meets the preset working condition, the urea injection amount of a urea injection module, the upstream NOX concentration detected by an upstream NOX sensor and the downstream NOX concentration detected by a downstream NOX sensor are obtained; determining a downstream NOX theoretical concentration based on the urea injection amount and the upstream NOX concentration; comparing the downstream NOX concentration with the downstream NOX theoretical concentration; when the downstream NOX concentration is larger than the downstream NOX theoretical concentration, it is determined that ammonia leakage happens to the SCR system. The ammonia leakage is judged according to the cross sensitivity of the existing downstream NOx sensor, the ammonia leakage mark is set, and the urea injection amount