Sonoelectrochemical-photocatalytic reactor for the treatment of wastewater with pollution loads, characterized in that it comprises: • at least one cylindrically shaped body, surrounded by a cooling mantle having a cooling water inlet and a cooling water outlet, and located on reactor balance legs, • a wastewater inlet allowing the wastewater to enter into the reactor, • a wastewater outlet allowing the water treated in the reactor to exit the reactor, • a transducer capable of providing frequency between the range of 20 to 800 kHz located at the reactor lower cover, allowing generation of ultrasonic waves, and, by being operated at different power levels, ensuring increase of mass transfer in the system and degradation of organic pollutants, • a bundle of electrodes having a parallel plate shape to be connected to a power supply by an electrode connection apparatus and immersed in the wastewater within the body, • a sampling hole and gas outlet hole found on the upper cover of the reactor, preferably closed by means of a stopper, and allowing the gas formed in the system to be accumulated in a different chamber, • a transducer connection flange allowing the transducer to be mounted to the transducer housing located at the reactor lower cover to be replaced according to the desired frequency based on the characteristics and amount of the wastewater, and • a UV lamp portably placed within the body and outside the electrode bundle, that can be removed when desired, and providing photocatalytic effect, whereby the electrode connection apparatus located on the reactor upper cover, mounted to electrode housings, and capable of moving in the vertical axis. • at least one cylindrically shaped body, surrounded by a cooling mantle having a cooling water inlet and a cooling water outlet, and located on reactor balance legs, • a wastewater inlet allowing the wastewater to enter into the reactor, • a wastewater outlet allowing the water treated in the reactor to exit the reactor, • a transducer capable of providing frequency between the range of 20 to 800 kHz located at the reactor lower cover, allowing generation of ultrasonic waves, and, by being operated at different power levels, ensuring increase of mass transfer in the system and degradation of organic pollutants, • a bundle of electrodes having a parallel plate shape to be connected to a power supply by an electrode connection apparatus and immersed in the wastewater within the body, • a sampling hole and gas outlet hole found on the upper cover of the reactor, preferably closed by means of a stopper, and allowing the gas formed in the system to be accumulated in a different chamber, • a transducer connection flange allowing the transducer to be mounted to the transducer housing located at the reactor lower cover to be replaced according to the desired frequency based on the characteristics and amount of the wastewater, and • a UV lamp portably placed within the body and outside the electrode bundle, that can be removed when desired, and providing photocatalytic effect, whereby the electrode connection apparatus located on the reactor upper cover, mounted to electrode housings, and capable of moving in the vertical axis.