The invention discloses a constraint prompting method of a static wheel load instrument. When the static wheel load instrument bears the load in a set quantity, the strain of an anti-overweight spiralglass bronze wire is changed into a critical number through a wire groove, by means of the resilient effect of the anti-overweight spiral glass bronze wire, a first balance weight, a second balance weight, a frosted plate and a belt pulley are crowded together, all the frameworks can jointly execute leftward rotation or rightward rotation along with a rotating roller, and therefore normal operation of the static wheel load instrument is formed. The defect that a static wheel load instrument in the prior art cannot transmit corresponding prompts, so that a worker can be in an unsafe state at any time is effectively avoided.