The invention relates to a rapid tester for the lodging-resistant strength of crops. The rapid tester mainly comprises a digital force measuring device, a dustproof panel, a ball guide rail, a linking plate, a rotary positioning disc, a circular surveying rod, a ground plug and a specific probe, wherein the digital force measuring device is fixed at the front end of the dustproof panel and can stably and slowly stretch and shrink in the horizontal direction through the ball guide rail; the circular surveying rod is marked with height scales and crop gravity center height scales and can be used for directly measuring the height of a canopy of a to-be-tested crop and reading the gravity center height of the to-be-tested crop; two arc-shaped positioning grooves are formed in the rotary positioning disc, and a horizontal testing position and a vertical testing position of the digital force measuring device are exchanged by virtue of sliding of two positioning screws, which are arranged on the linking plate, in the arc-shaped positioning grooves; the horizontal height of the digital force measuring device can be adjusted by changing the fixed position of the rotary positioning disc on the circular surveying rod. The rapid tester can be used for rapidly testing critical breakage strength of stalks and lodging-resistant strength of single stems and groups of wheat, rice, grain and millet.