A modular fixture for a microfluidic chip comprises upper plate assemblies and lower plate assemblies and further comprises movable clamps, wherein a space for accommodating the microfluidic chip is formed between the upper plate assemblies and the lower plate assemblies; each upper plate assembly comprises a fixture cover plate and a liquid feed module which is detachably connected to the fixture cover plate, and a liquid feed pipe communicated with the space is arranged on the liquid feed module; each lower plate assembly is provided with support rods, through holes allowing the support rods to penetrate out are formed in the corresponding upper plate assembly, the support rods penetrate the corresponding upper plate assembly through the through holes, and the movable clamps are fixed on the support rods at the upper part of the upper plate assembly and propped against or loosened from the upper plate assembly by rotating in different directions, so that the upper plate assembly and the lower plate assembly are in a locking state or unlocking state. The modular fixture for the microfluidic chip is simple in structure and easy to assemble and dismount.