The invention provides a testing device for a muddy water tube push bench.The testing device can test the working performance of a tube push muddy water circulation system and the performance of a tunnel portal water stopping seal and provide a guarantee for construction safety.The testing device comprises a counter-force frame and a cylinder supporting frame.Supporting guide rails are arranged on the cylinder supporting frame, a tube push bench support and a pressure bearing device are matched with the supporting guide rails, and a push boot is connected with the counter-force frame.The tube push bench support comprises a bearing table, bearing roller wheels are arranged at the bottom of the bearing table, the lower portions of sliding supporting blocks are arranged in sliding rails at the top of the bearing table, and supporting seats are connected to the upper portions of the sliding supporting blocks.The pressure bearing device comprises a pressure bearing cylinder fixed to the cylinder supporting frame, and a tunnel portal water stopping seal is arranged on the pressure bearing cylinder.The testing device can be used for testing the muddy water circulation system under pressure, and also has the functions of detecting the performance of the tunnel portal water stopping seal and testing secondary rock breaking capability.The testing device for the muddy water tube push bench is easy to operate, low in price and very ideal.