The utility model provides a straight well volume fracturing string, include first fracturing subassembly, first fracturing oil pipe by supreme setting down, the intercommunication has a plurality of second fracturing subassemblies between first fracturing subassembly and the first fracturing oil pipe, and the interval sets up about a plurality of second fracturing subassemblies, first fracturing subassembly is including setting up just the throttle tip sand jet and the adaptor of intercommunication each other from top to bottom, second fracturing subassembly is including setting up just the throttle side opening sand jet and the expanding packer of intercommunication each other from top to bottom, throttle tip sand jet corresponds the different oil gas layers in the straight well respectively with each throttle side opening sand jet, the first orifice and the second orifice of throttle side opening sand jet of throttle tip sand jet can be opened under the pressure of fracturing fluid to make the fracturing fluid carry out the fracturing to the rock stratum, thereby shortened the engineering time, reduced construction cost, provide necessary technological means for old well straight well volume fracturing.