Diesel engine tail gas selective catalysis reducing agent adding device

The utility model discloses a diesel engine tail gas selective catalysis reducing agent adding device simple in structural style. The diesel engine tail gas selective catalysis reducing agent adding device comprises a normally-closed reducing agent storage container, an atomization device arranged in the storage container and an atomized gas outlet formed in the top of the storage container, and the negative pressure pipe of a diesel engine tail pipeline is communicated with the atomized gas outlet. An electric pump or a compressed gas source or other frequently-used reducing agent pressure driving devices or atomization nozzles frequently used at present are not needed, only an ultrasonic nebulizer is in contact with reducing agents, the low temperature refrigeration performance of a system is excellent, the whole system structural composition is simple, working components are few, and the reliability and economical efficiency of the system are improved.