The invention discloses a 3DP process forming system and an operation method thereof. The 3DP process forming system comprises a rack of a metal frame structure. A modular forming cylinder is arrangedin the rack. A printing device and a powder feeding device are arranged at the position, on the upper portion of the modular forming cylinder, of the rack. The printing device and the powder feedingdevice are connected with Y-direction linear guide rails on the rack through sliding blocks and are used for moving on the Y-direction linear guide rails to carry out powder laying and printing. A part taking auxiliary device is arranged at the top of the rack. A physical curing device is arranged in the part taking auxiliary device. Powder storage boxes are arranged on the two sides of the rack.According to the 3DP process forming system and the operation method thereof, the problem that the uniformity of powder particles laid on a powder bed and the density of the powder bed cannot be guaranteed at the same time is solved, the problem of nozzle blocking caused by raising dust caused by laid powder motion is effectively avoided, and the equipment forming efficiency and the part taking efficiency are greatly improved.