Integration of sensor, energy harvesting and flexible textile has been considered as a promising strategy applied in the fields of wearable electrics, artificial intelligence. Herein, flexible, multifunctional conductive textiles consist of quaternary composites of two-dimensional (2D) vanadium carbides (V₂CT_x) MXene, highly conductive poly(3, 4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS), liquid metal (LM), and one-dimensional carbon nanotube (CNT) (for simplicity denoted as MPLC) were fabricated to construct a three-dimensional (3D) network with remarkable conductivity and Joule heating properties for applications in wearable heaters and TENG based on-skin sensors by adopting a simple method of dip-coating. The TENG using MPLC as the electrode and the triboelectric layer demonstrates excellent energy harvesting capability. TENG based self-powered sensor shows an open circuit voltage (V_oc) of 118.5 V, short circuit current (I_sc) of 1.23 μA and maximum output power of 57.12 μW under mechanical friction. In addition, fast Joule heating in response to a saturation temperature of 221 °C at a driving voltage of 3 V is achieved. Our study provides a simple, lightweight, and effective multifunctional system with integrated characteristics of superior sensing and electrothermal conversion, which are highly desired for applications in wearable electronics, intelligent electronics, and personal self-heating system.