A ride-on toy brake performance testing machine includes a drive control device and a ramp, wherein the drive control device is internally provided with a power source, and an upper surface of the ramp is provided with a friction layer; a power output end of the drive control device is connected with the ramp through a connecting structure, so as to control an tilt angle of the ramp; the ride-on toy brake performance testing machine also includes a linear guide rail pair and a tensile testing device which is arranged at an upper part of an upright post; the tensile testing device moves up and down relatively to the upright post; a lower part of the upright post is arranged at the upper end of the ramp; a linear guide rail of the linear guide rail pair is arranged on the ramp along an inclined direction; and a sensor is arranged on a sliding block of linear guide rail pair. The ride-on toy brake performance testing machine has the advantages of being simple in structure, convenient in use, capable of measuring the braking performance of different types of ride-on toys of children, , multiple in function, and easy in adjusting the tilt angle of the ramp.