A waterproof thermometer for monitoring food temperatures during a cooking process, comprising: a first portion, comprising: a battery; and a circuit board, configured to be electrically connected to the battery, and comprising at least one thermal sensor and a processing unit; wherein the thermal sensor is configured to measure the food temperature, and the processing unit is electrically connected to the thermal sensor; and a second portion, comprising an antenna; wherein the second portion is connected to the first portion, and the antenna is electrically connected to the processing unit of the circuit board; wherein the processing unit is configured to convert the food temperatures measured by the thermal sensor to thermometer data and wirelessly transmit the thermometer data via the antenna; wherein the second portion further comprises a two-layer shell which forms a moisture barrier to prevent water from entering the waterproof thermometer; the waterproof thermometer being characterized in further comprising: a first conductive part; wherein a part of the first conductive part is located in the first portion, and another part of the first conductive part is located in the second portion; a first insulating part, configured to be connected to the first conductive part, and located in the second portion; wherein the antenna is located inside the first insulating part; a second insulating part, configured to be connected to the first conductive part, located in the second portion, and further arranged to surround the first insulating part; and a second conductive part, configured to be electrically connected to the circuit board, located in the second portion, and further connected to the first insulating part and the second insulating part; wherein the first insulating part and the second insulating part form the two-layer shell of the second portion. a first portion, comprising: a battery; and a circuit board, configured to be electrically connected to the battery, and comprising at least one thermal sensor and a processing unit; wherein the thermal sensor is configured to measure the food temperature, and the processing unit is electrically connected to the thermal sensor; and a battery; and a circuit board, configured to be electrically connected to the battery, and comprising at least one thermal sensor and a processing unit; wherein the thermal sensor is configured to measure the food temperature, and the processing unit is electrically connected to the thermal sensor; and a second portion, comprising an antenna; wherein the second portion is connected to the first portion, and the antenna is electrically connected to the processing unit of the circuit board; wherein the processing unit is configured to convert the food temperatures measured by the thermal sensor to thermometer data and wirelessly transmit the thermometer data via the antenna; wherein the second portion further comprises a two-layer shell which forms a moisture barrier to prevent water from entering the waterproof thermometer; the waterproof thermometer being characterized in further comprising: a first conductive part; wherein a part of the first conductive part is located in the first portion, and another part of the first conductive part is located in the second portion; a first insulating part, configured to be connected to the first conductive part, and located in the second portion; wherein the antenna is located inside the first insulating part; a second insulating part, configured to be connected to the first conductive part, located in the second portion, and further arranged to surround the first insulating part; and a second conductive part, configured to be electrically connected to the circuit board, located in the second portion, and further connected to the first insulating part and the second insulating part; wherein the first insulating part and the second insulating part form the two-layer shell of the second portion.