The utility model discloses a three-channel central venous pressure monitoring and treating device. The three-channel central venous pressure monitoring and treating device comprises a deep venous catheter (1), a three-channel rotary valve (2), a filter connector (4), a constant-speed infusion apparatus (5), a pressure energy exchanger (6), a laser emitter (7), a bracket (8) and a computer (9), wherein one end of the three-channel rotary valve (2) is connected with the deep venous catheter (1) while the other end is connected with the filter connector (4); the three-channel rotary valve (2) is connected with each of the filter connector (4), the constant-speed infusion apparatus (5) and the pressure energy exchanger (6), the pressure energy exchanger (6) is connected with computer (9) through a signal wire, and the laser emitter (7) and the pressure energy exchanger (6) are fixed on a fixing frame of the bracket (8). The three-channel central venous pressure monitoring and treating device adopts zero setting, is easy and reliable to operate, is capable of simultaneously opening two or more channels to simultaneously perform precise infusion and intravenous blood sampling and so on, is simple in structure, is convenient to clean, and can be used repeatedly after being sterilized.