The invention provides an opposite 
expansion wave superposition type self-driven 
supercharger and belongs to supercharging devices in the refrigerating and heating field. The 
supercharger makes use of an opposite 
expansion wave superposition mechanism, makes efficient use of 
heat energy and pressure energy of driving fluid, improves supercharging performance and has the self-driven characteristic. According to the 
supercharger, a main 
machine body is connected with an upper 
machine body and a lower 
machine body through flanges, the main machine body comprises a shell and an 
expansion wave superposition 
pipe revolving drum, a plurality of high-pressure driving liquid inlets distributed circumferentially and evenly and a plurality of low-pressure expansion fluid outlets distributed circumferentially and evenly are formed in the shell in a centering mode, expansion wave superposition pipes are circumferentially and evenly distributed on the expansion wave superposition 
pipe revolving drum, and 
skew surface transition square holes are formed in the centering position of the expansion wave superposition 
pipe revolving drum. The upper machine body and the lower machine body are symmetrically arranged relative to the main machine body and are each provided with a plurality of detachable 
nozzle combinations circumferentially and evenly distributed, and each detachable 
nozzle combination is composed of a supercharging fluid 
nozzle and a lower-pressure driven fluid nozzle. Through middle 
skew surface transition inlets, the revolving drum is driven to revolve, no driving machine is needed, sealing is good, and maintenance is easy. Low-temperature fluid expanded secondarily is discharged through the low-pressure expansion fluid outlets, and a 
temperature drop is large. Supercharging 
airflow is discharged through the supercharging fluid nozzles at two ends, and the supercharging effect is good.