The invention discloses a wedge microgroove group micro cold plate. The micro cold plate is composed of a series of wedge microgroove channel arrays which are identical in structure and shape. The groove channel width linearly converges to the central axis direction in the section from the inlet of the wedge microgroove channels to the outlet of the groove channels, the groove channel height linearly diverges in the vertical and upward direction, and the groove channel width convergence ratio and the groove channel height divergence ratio are mutually reciprocal. The wedge microgroove group micro cold plate is high in heat radiation efficiency and high in fluid-structure interaction heat transfer capability so that the heat radiation requirements of the ultrahigh thermal power density electrical parts and components and systems can be met, the hydraulic pressure loss is low, the required power consumption is low and the development of the heat radiation technology of the microgroove group micro cold plate can be facilitated.