A retractable shielding apparatus includes an adjusting base, a fixing base, two retractable shields, a shuttle, and a cable. The two retractable shields are assembled to two ends of the shuttle respectively with one corresponding end thereof. The adjusting base and the fixing base are respectively fixed to the opposite other end of the corresponding two retractable shields. The cable adjustably connects the adjusting base, the two retractable shields, the shuttle and the fixing base together. The shuttle is slidably located between the adjusting base and the fixing base and is configured to slide along the path formed by the cable, such that the two retractable shields can be extended or retracted together with the shuttle.