The invention discloses a test platform for microseismic testing of rock mass fractures. The test platform comprises at least one microseismic sensor, push rods which are arranged at the two ends of the microseismic sensor through connecting mechanisms and used for putting the microseismic sensor into a monitoring hole, lead-in mechanisms which are mounted on the push rods and used for introducing the microseismic sensor into the monitoring hole, a hydraulic system which provides hydraulic support for the microseismic sensor, and a microseismic monitoring computer which is connected to the microseismic sensor through signals, wherein the microseismic sensor comprises a microseismic probe, a holding component for holding the microseismic probe, a support plate and a hydraulic support mechanism; the connecting mechanisms are used for enabling the push rods to swing relative to the microseismic sensor; the lead-in mechanisms adopt three-roller lead-in mechanisms. The test platform can satisfy the need that a plurality of microseismic sensors perform microseismic detection on different parts of the deep monitoring hole, and solves the problems that in the prior art, it is difficult to guarantee microseismic sensors and monitoring holes to effectively contact and couple, and the microseismic sensors have poor installation convenience and the like. Therefore the monitoring accuracy of the microseismic sensors is improved, and the engineering costs of a microseismic monitoring system are reduced.