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• An OAM inter-mode interferometry is proposed to achieve OAM-basis wavefront single-pixel imaging (OAM-WSPI), in which the 0 th -order OAM mode with the necessary phase-shiftings is used as the reference field, and the other-order OAM modes are used as the modulation patterns for sampling the target wavefront. • The proposed method does not require sacrificing the pixel of the SLM to introduce the reference light, which enhancement the resolution of existing common-path OAM-WSPI. • Experimental demonstrations suggest the feasibility and effectiveness of the proposed method and reconstruct the different target wavefronts with high resolution, employing the LG basis and Bessel basis, respectively. Wavefront single-pixel imaging (WSPI) allows the development of imaging systems where pixel-array detectors are immature or even unavailable. However, the state-of-the-art common-path interference-based WSPI methods generally sacrifice the pixels of the spatial light modulator (SLM) to introduce the reference light reducing the imaging resolution. Here, we propose to use inter-mode common-path interferometry to improve the spatial resolution of orbital angular momentum basis wavefront single-pixel imaging (OAM-WSPI), since the inter-mode interferometry does not sacrifice the pixels of the SLM to introduce reference light. Experimental demonstrations suggest the feasibility and effectiveness of the proposed method. Such a method has potential applications in the fields of high-resolution holography applications, in which OAM beams need to be used. [ABSTRACT FROM AUTHOR]