The invention relates to a portable pressure calibrator which comprises a pressure gauge box, a pressure indicating gauge arranged on the pressure gauge box, a precise pressure gauge in the pressure gauge box, and a 
high pressure tank arranged at the lower end of the precise pressure gauge, wherein an air inlet 
check valve is arranged on one side of the 
high pressure tank; a pressure guiding pipeis arranged on an air inlet 
pipe and is connected with the pressure indicating gauge; an air source outgoing interface is arranged on an air 
exhaust pipe on the other side of the 
high pressure tank; an outgoing valuator is arranged on the air 
exhaust pipe; and an air exhaust valuator is arranged on a communicating 
pipe A. The portable pressure calibrator has the advantages that the structure is simple, the carrying is convenient, the operation is flexible, the time wasted on dismounting a 
transmitter is decreased, and errors caused by bumping and collision during the transportation are reduced; the calibration accuracy of the calibrator can be guaranteed while the calibration efficiency is improved; and in the whole calibration process, any electric pressurized equipment is not needed, and no 
energy consumption and loss are caused, so by using the portable pressure calibrator, the carbon output is low, the environment is protected, the energy is saved and the efficiency is high.