A fully-automated handheld pressure calibrator, comprising a housing, and gas circuit components and electrical circuit components assembled in the housing, wherein, the gas circuit components comprise a pressure source capable of supplying pressurized gas, the constituents of the gas circuit components and the constituents of the electrical circuit components are integrated and assembled in the housing in a modular form, and the overall profile of the calibrator is suitable for holding in hand; the constituents of the gas circuit components include: a micro intelligent gas distribution module comprising a micro gas pump, configured to provide pressurized gas and vacuum for the pressure calibrator, wherein the micro gas pump serves as the pressure source; a micro intelligent pressure control module, configured to control and regulate the pressurized gas and vacuum from the micro intelligent gas distribution module; a standard pressure module, configured to provide reference pressure for the pressure calibrator; and a micro intelligent pressure interface module, configured to connect the micro intelligent pressure control module and the standard pressure module; a positive pressure connector and a vacuum connector of the micro intelligent gas distribution module are plugged in and communicate with corresponding pressurized gas interface and vacuum interface of the micro intelligent pressure control module, a control module pressure connector of the micro intelligent pressure control module communicates with a gas pressure input interface of the micro intelligent pressure interface module, and a gas circuit interface of the standard pressure module is butt-jointed with a gas circuit interface of the micro intelligent pressure interface module; wherein, the micro intelligent gas distribution module further comprises a gas source terminal block, wherein, the gas source terminal block is connected with the micro gas pump and communicates with a gas circuit, a primary gas suction pipeline configured to suck external gas and a secondary gas discharge pipeline configured to output pressurized gas are provided in the micro gas pump, a positive pressure gas chamber and a vacuum gas chamber are provided in the gas source terminal block, the two gas chambers communicate with the two pipelines (114, 122) of the micro gas pump and are controlled via micro solenoid valves valve V1, valve V2 and valve V3 provided in the gas source terminal block. a micro intelligent gas distribution module comprising a micro gas pump, configured to provide pressurized gas and vacuum for the pressure calibrator, wherein the micro gas pump serves as the pressure source; a micro intelligent pressure control module, configured to control and regulate the pressurized gas and vacuum from the micro intelligent gas distribution module; a standard pressure module, configured to provide reference pressure for the pressure calibrator; and a micro intelligent pressure interface module, configured to connect the micro intelligent pressure control module and the standard pressure module; a positive pressure connector and a vacuum connector of the micro intelligent gas distribution module are plugged in and communicate with corresponding pressurized gas interface and vacuum interface of the micro intelligent pressure control module, a control module pressure connector of the micro intelligent pressure control module communicates with a gas pressure input interface of the micro intelligent pressure interface module, and a gas circuit interface of the standard pressure module is butt-jointed with a gas circuit interface of the micro intelligent pressure interface module; wherein, the micro intelligent gas distribution module further comprises a gas source terminal block, wherein, the gas source terminal block is connected with the micro gas pump and communicates with a gas circuit, a primary gas suction pipeline configured to suck external gas and a secondary gas discharge pipeline configured to output pressurized gas are provided in the micro gas pump, a positive pressure gas chamber and a vacuum gas chamber are provided in the gas source terminal block, the two gas chambers communicate with the two pipelines (114, 122) of the micro gas pump and are controlled via micro solenoid valves valve V1, valve V2 and valve V3 provided in the gas source terminal block.