The invention discloses a deinked pulp control system of a newsprint machine platform. The deinked pulp control system comprises a hydraulic pulping machine, a hydraulic impurity removing machine, a filtering sieve, an unloading pulp tower, a coarse filtration device, a fine screening system, a deinking groove, a sand removing device and a hot dispersion bleaching system, wherein liquid pumps and control valves are arranged between each two sets of equipment of the hydraulic pulping machine, the hydraulic impurity removing machine, the unloading pulp tower, the coarse filtration device and the fine screening system, and between the deinking groove and the sand removing device; the deinking groove is internally provided with a liquid level detection sensor and a three-way water valve; the sand removing device is internally provided with an ash detection sensor; the hot dispersion bleaching system is provided with a temperature sensor and a heating controller; the liquid pumps, the control valves, the liquid level detection sensor, the three-way water valve, the ash detection sensor, the temperature sensor and the heating controller are connected with a controlling module. According to the system disclosed by the invention, a deinked pulp production process is detected in real time and production parameters are adjusted in time; proportions of raw materials and chemical auxiliary materials are optimized; the production process is stabilized and the production cost is reduced.