The utility model belongs to the field of hydrology and meteorology and relates to a rain gauge at an equal time interval, in particular to a device for measuring rainfall in different time intervals. The rain gauge comprises a primary rain bucket, a case, a middle connecting pipe, a secondary rain bucket, a water distribution conduit, a stepping motor control device and a rain glass, wherein the primary rain bucket is inserted into the case and connected with the middle connecting pipe, the secondary rain bucket is arranged below the middle connecting pipe, the lower part of the secondary rain bucket is connected with the water distribution conduit, both ends of the water distribution conduit are closed, a downward opening is arranged at the remote end, and the rain glass is arranged below the opening. The rain gauge has the advantages that: 1. the equal time interval division of the rainfall is realized through the manner of a stepping motor; and 2. As long as the rain glasses are sufficient, the time division can be quite precise by replacing the rain glass and shortening the retention time of each step of the stepping motor.