The invention relates to a novel three dimensional stress measuring sensor, which comprises a machine body and hardware circuits, wherein the machine body is composed of a metal hollow elastic body and resistance strain gages, and is buried in bituminous concrete, the resistance strain gages are in three groups, the three groups are used for measuring the component of the applied stress in X, Y, and Z directions respectively, each group has four resistance strain gages, and when stress is applied on the metal hollow elastic body, two resistance strain gages are pulled and two are pressed in each group, and strain symbols are opposite; the hardware circuits comprise differential type Wheatstone full bridge circuits, zero setting circuits, an amplifying circuit, an acquisition module, a digital filtering module, a communicating module, and a power supply circuit; the three groups of the strain gages make up the three differential type Wheatstone full bridge circuits respectively, and each differential type Wheatstone full bridge circuit is in external connection with a zero setting circuit; outputs of the three groups of the each differential type wheatstone full bridge circuits are communicated with a PC machine through the amplifying circuit, the acquisition module, the digital filtering module, the communication module.