The invention discloses a mixer truck controller, a control system and a using method in the mixer truck controller. The mixer truck controller comprises a road condition judgment module, a loaded material judgment module and a control module, wherein the road condition judgment module is used for detecting the road condition; the loaded material judgment module is used for judging the state of a loaded material inside a mixer truck tank by detecting the pressure difference between two high-pressure oil ports of an oil pump; and the control module is used for sending a rotating speed control instruction and a torque control instruction corresponding to the road condition on the corresponding state of the loaded material to an engine. Due to the fact that the proper torque and rotating speed of the mixer truck controller can be automatically limited according to the road condition and the state of the loaded material, working of the engine of the mixer truck can be well controlled according to a rotating speed control instruction and a torque control instruction formulated by the limits of the mixer truck controller even when a driver does not have good enough driving experience, and the fuel oil consumption of the whole mixer truck will not be too high.